Thunder 3 Reveals Main Trailer, New Visual and More Cast for Netflix Sci-Fi Anime
Thunder 3 has released a new main trailer, key visual and additional cast information, giving fans a stronger look at one of 2026’s strangest and most visually unusual anime premieres.
The anime, based on Yuki Ikeda’s sci-fi manga, began airing in Japan on July 8, 2026, through Fuji TV’s +Ultra programming block. It is also available for streaming on Netflix, where the series is listed as a 2026 anime title with sci-fi, fantasy, isekai and superpower elements.
The new trailer highlights the anime’s biggest twist: what begins like a simple story about ordinary middle school boys suddenly opens into a bizarre multiverse adventure filled with aliens, superhuman powers, flying warships and a completely different visual language.
The main visual shows the “Small 3” facing huge weapons and aerial battles in a multiverse version of Shibuya, setting the tone for a series that mixes school comedy, hard science fiction, alien invasion and meta-style visual experimentation.
Thunder 3 Is Now Streaming on Netflix
Thunder 3 premiered in Japan on July 8, 2026, airing every Wednesday night on Fuji TV’s +Ultra block and later across other Japanese stations.
The anime is also streaming on Netflix. The platform describes the story as following ordinary middle schoolers Pyontaro, Hiroshi and Tsubame, who are pulled into an extraordinary adventure when Pyontaro’s little sister goes missing.
This streaming release is important because Thunder 3 is the kind of anime that benefits from immediate global accessibility. Its premise is weird, its visual style is unusual and its first major twist depends on surprise. Being available on Netflix gives international viewers a chance to experience that shift without waiting for a delayed release.
Unlike many anime that slowly build toward their fantasy or sci-fi premise, Thunder 3 plays with viewer expectations almost immediately. The early scenes look like a cute, slightly crude middle school comedy. Then the story violently opens into another world, and the visual style changes with it.
The Main Trailer Reveals a Multiverse War
The new main trailer focuses on the series’ reality-bending premise.
Pyontaro, Tsubame and Hiroshi are ordinary middle schoolers known as the Small 3. One day, they watch a strange disc given to them by their teacher, only to discover that it is connected to another universe. While they are not paying attention, Pyontaro’s little sister Futaba is sucked into that world.
From there, the boys enter a multiverse filled with threats that look nothing like their everyday lives.
The trailer shows the Small 3 facing alien forces, massive weapons and aerial battles in an alternate version of Shibuya. It also teases the fact that the boys can use superhero-like powers inside this other world, creating a sharp contrast between their small, cute designs and the dangerous reality around them.
That contrast is one of the central appeals of Thunder 3. The boys look harmless, almost like characters from a gag manga, but the world they enter is filled with realistic scenery, violent science fiction danger and enemies that feel far more serious than they do.
What Is Thunder 3 About?
Thunder 3 follows Pyontaro Tezuka, a plain middle school boy whose little sister, Futaba, adores him.
Pyontaro spends his ordinary days with his two classmates, Tsubame Azuma and Hiroshi Ochanomizu. Together, the three boys are known as the “Small 3,” a nickname that fits their unimpressive social position and silly everyday energy.
One day, their teacher lends them a strange disc. The boys decide to watch it, but the disc turns out to be connected to another universe. When Futaba is pulled through the screen and into that world, Pyontaro and his friends must follow her.
What waits on the other side is not a simple fantasy land.
It is a multiverse filled with aliens, mysterious forces, realistic environments and dangers that the Small 3 are completely unprepared to understand. Yet inside that world, the boys seem to gain powers that could make them far stronger than they ever were in their own reality.
The story becomes a rescue mission, but also a collision between two visual worlds: one cute and cartoonish, the other realistic, hostile and overwhelming.
The Main Visual Shows the Small 3 Against Impossible Odds
The newly released main visual places the Small 3 in the middle of a massive multiverse conflict.
The artwork shows Pyontaro, Tsubame and Hiroshi standing against huge weapons and flying battleships in an alternate Shibuya. It immediately communicates the scale of the danger around them. These are not heroic teenagers entering a familiar fantasy quest. They are small, strange-looking kids trapped inside a world that seems far too large and violent for them.
That is exactly what makes the visual effective.
Thunder 3’s central image is one of mismatch. The protagonists look like they belong in a light comedy. The world around them looks like a serious science fiction disaster. The humor, tension and originality of the series all come from that collision.
The main visual also suggests that the anime will not remain limited to Futaba’s disappearance. The story appears ready to expand into a larger conflict involving alien forces, human resistance and the structure of the multiverse itself.
The Additional Cast Expands the Multiverse Side
The new update revealed several additional cast members tied to characters who become important after the first episode.
- Shogo Sakata as Doku
- Taito Ban as Teichi Segami
- Yuki Hirose as Suzuka Tashiro
- Ryoko Maekawa as Mio Kisaragi
- Haruki Ishiya as Kyoji Sumeragi
The official Japanese announcement also names additional members connected to the mysterious group known as Rebellion, including characters played by Yuki Onodera, Yuki Shin and Miho Wataya.
These new characters are important because Thunder 3 cannot remain only a story about three boys lost in another world. Once the multiverse opens, the anime needs people who understand its rules, conflicts and dangers better than the protagonists do.
Characters like Teichi Segami and the Rebellion members help expand the story beyond a rescue mission and into a larger sci-fi struggle.
The Main Cast of Thunder 3
The main cast includes:
- Sayumi Suzushiro as Pyontaro Tezuka
- Natsumi Kawaida as Tsubame Azuma
- Eri Akiyama as Hiroshi Ochanomizu
- Honoka Mitsubachi as Futaba Tezuka
This casting is central to the anime’s tone because the protagonists need to feel like ordinary, ridiculous, awkward kids before the multiverse danger begins.
Pyontaro is not introduced as a cool hero. He is a unimpressive middle school boy who is constantly bothered by his little sister’s affection. Tsubame and Hiroshi are his equally ordinary friends, making the trio feel more like a group of school comedy characters than destined saviors.
That makes the later shift into alien conflict much stronger.
The audience first sees them as harmless kids. Then the anime asks them to survive a world where logic and reasoning no longer apply.
Yuuri Performs the Opening Theme “Thunderbolt”
The main trailer also previews the opening theme song, “Thunderbolt”, performed by Yuuri.
The song was written to match the energy of the Small 3 and the other characters who must find courage in an impossible situation. Its title also fits the series perfectly, connecting directly to the anime’s name and explosive tone.
Thunder 3 is a story about sudden shock. The protagonists move from ordinary life into a dangerous multiverse almost like being struck by lightning. The opening theme’s title captures that feeling of impact, speed and emotional ignition.
Yuuri’s involvement gives the anime a strong musical identity from the start. A series with such an unusual visual style needs a theme song that can sell both excitement and surprise, and “Thunderbolt” appears designed to push that heroic energy forward.
The Ending Theme Is “Shururerira” by Otoha
The ending theme is “Shururerira” by Otoha.
The official site describes the ending animation as showing Futaba and her dog looking at the television screen while also reflecting the charm of the series. That softer image matters because Thunder 3 is not only about sci-fi spectacle. At its core, it is a story about a big brother trying to rescue his little sister.
The ending theme can therefore carry a different emotional function from the opening.
While “Thunderbolt” pushes the adventure forward, “Shururerira” can remind viewers of the childhood imagination, family warmth and strange sense of wonder that make the story more than an alien battle show.
Thunder 3 works best when it remembers both sides: the huge sci-fi conflict and the small family bond that starts everything.
UNEND Handles Animation Production
Animation production is handled by UNEND.
This is one of the most important parts of the project because Thunder 3’s identity depends heavily on visual contrast. The anime has to make the ordinary world and the multiverse feel completely different, while still allowing both to exist inside the same story.
The original manga is known for blending cute character art with realistic and detailed science fiction environments. That combination is difficult to translate into animation because the contrast must feel intentional, not accidental.
If the cute character designs look too disconnected from the realistic world, the audience may feel pulled out of the story. But if the anime embraces that mismatch as part of the concept, the visual style can become one of its strongest features.
Thunder 3 is not trying to look like every other anime. Its strangeness is part of the point.
Hiroyuki Seshita Serves as Chief Director
Hiroyuki Seshita serves as chief director for the anime.
That is a notable name for a science fiction project. Seshita has experience with CG-heavy and large-scale sci-fi works, making him a fitting creative figure for a series that moves from school comedy into aliens, multiverse spaces and massive mechanical threats.
Thunder 3 needs someone who can understand scale.
The story begins small, with middle school boys, a little sister and a strange disc. But once the multiverse opens, the anime suddenly has to deal with another world, alien forces, flying battleships, resistance groups and superhuman abilities.
The chief direction must help those elements feel connected rather than chaotic for the wrong reasons.
Keisuke Ide Directs the Series
Keisuke Ide directs Thunder 3.
His role is especially important because the anime has a difficult tonal balance. It must begin as a school and family comedy, then shift into science fiction action without losing the identity of the protagonists.
If the ordinary world feels too brief, the emotional rescue mission may not land. If the comedy lasts too long, the multiverse danger may feel delayed. If the sci-fi world becomes too serious, the strange charm of the Small 3 could disappear.
The director’s challenge is to keep the viewer aware that all of these contradictions are intentional.
Thunder 3 is supposed to feel like two different kinds of manga crashing into each other. The anime’s job is to make that crash exciting rather than confusing.
Koji Seko Handles Series Composition and Script
Koji Seko is credited with series composition and script on the official anime website.
That position is crucial because Thunder 3’s story depends on surprise, pacing and escalation.
The series cannot reveal too much too quickly, but it also cannot stay in ordinary comedy for too long. The entire appeal comes from the moment the audience realizes that the strange disc is not a joke and that the world beyond the screen is dangerous.
A good adaptation must preserve that shock while still giving viewers enough emotional grounding to care about Futaba’s disappearance.
The script also has to manage the expanding cast. Once characters like Teichi Segami and the Rebellion members appear, the anime must explain the multiverse without burying the audience in exposition.
The Main Staff Behind Thunder 3
The main staff includes:
- Original Creator: Yuki Ikeda
- Chief Director: Hiroyuki Seshita
- Director: Keisuke Ide
- Assistant Directors: Shin Sugai and Ryunari
- Series Composition and Script: Koji Seko
- Original Character Design: Naoyuki Onda
- Animation Character Design: Junko Yamanaka and Yuki Moriyama
- Animation Director: Koji
- Production Design: Naoya Tanaka and Ferdinand Paturi
- Mechanical Design: Takehiko Hoashi
- Art Directors: Yusuke Kamei and Keigo Nakamura
- Sound Director: Takayuki Yamaguchi
- Music: Frederic Chateau and Akiyuki Tateyama
- Planning and Production: Slow Curve
- Animation Production: UNEND
This staff list shows how much the anime depends on design and world construction. Thunder 3 needs character design, mechanical design, production design and background art to work together because the story’s main appeal is visual collision.
The cute protagonists and the realistic multiverse must feel like they belong to different worlds, but also to the same anime.
The Manga Comes From Yuki Ikeda
Thunder 3 is based on the manga by Yuki Ikeda, serialized in Kodansha’s Monthly Shonen Magazine.
The series became known for its unusual mix of art styles, hard science fiction elements and meta-comedy. Kodansha USA describes it as a comic unlike any other, built around a combination of visual styles and science-fiction adventure.
That description is not exaggeration. Thunder 3’s biggest identity is the way it makes different realities look different on the page. The ordinary children look cartoonish and simple. The other universe looks detailed, realistic and dangerous.
The anime adaptation therefore faces a unique challenge. It cannot simply smooth everything into one standard style. It has to preserve the shock of seeing these characters step into a world that does not look like it was drawn for them.
The Story Begins With a Missing Little Sister
For all its multiverse spectacle, Thunder 3 begins with something simple and emotional: Futaba goes missing.
Futaba is Pyontaro’s little sister, and she adores him. Her affection annoys him in the way younger siblings often annoy older siblings, but her disappearance immediately gives the story a personal reason to move forward.
Pyontaro does not enter the multiverse because he wants adventure. He enters because his sister is trapped there.
That matters.
The sci-fi world may be huge, but the emotional starting point is small. A boy needs to find his sister. His friends help him. That simple rescue mission gives the anime its heart, even when the scale grows to include alien threats and parallel-world warfare.
The “Small 3” Are Not Typical Heroes
Pyontaro, Tsubame and Hiroshi are not typical anime heroes.
They are ordinary middle school boys. They are awkward, silly and unimpressive. Their nickname, the Small 3, almost sounds like a joke before it becomes heroic.
That is part of the fun.
The anime’s tagline suggests that only they can save the world. The comedy comes from how unlikely that sounds. These are not legendary warriors or elite students. They are kids who accidentally become involved in something far larger than themselves.
Inside the multiverse, however, the Small 3 seem to gain incredible power. That creates a strange superhero dynamic. Their bodies and personalities still look small and childish, but their abilities may be strong enough to challenge terrifying enemies.
The result is a superhero story told through characters who look completely wrong for the job, which makes them more memorable.
The Multiverse Changes the Rules
The official site uses the phrase that, in this world, logic and reasoning are null and void.
That line captures the energy of Thunder 3 perfectly.
The boys enter a world where the rules they know no longer apply. A television screen becomes a door. A strange disc becomes a bridge between universes. A missing sister becomes the key to a larger conflict. Small middle schoolers suddenly find themselves able to fight like heroes.
This is not a clean portal fantasy where the new world immediately explains itself.
Thunder 3 thrives on confusion, surprise and visual contradiction. The multiverse does not feel like a comfortable fantasy playground. It feels like a dangerous system the protagonists barely understand.
That uncertainty helps keep the story tense. The Small 3 may be powerful in this world, but power does not mean they understand what is happening.
Alien Threats Give the Series a Hard Sci-Fi Edge
The alien forces in Thunder 3 are part of what separates it from a standard isekai adventure.
Many isekai stories transport characters into fantasy worlds with magic, kingdoms and monsters. Thunder 3 instead pushes its protagonists into a world shaped by aliens, machinery, realistic cityscapes and massive military-style conflict.
That gives the anime a harder science fiction edge.
The enemies do not feel like ordinary fantasy monsters. The weapons, warships and world design suggest a hostile alternate reality with its own history and systems. The protagonists are not only lost, they are entering a conflict already in motion.
This makes the story feel bigger than a simple rescue mission, even though rescuing Futaba remains the emotional core.
Rebellion May Become a Key Group
The new trailer and cast update mention the mysterious organization known as Rebellion.
Characters connected to this group appear to be fighting against the alien threat, and several newly announced cast members are tied to them.
This is important because Rebellion may become the bridge between the Small 3 and the larger conflict of the multiverse. Pyontaro and his friends are newcomers. They do not know the world, the enemy or the rules. A resistance group can provide information, allies and a sense of scale.
At the same time, Thunder 3’s strange tone means Rebellion may not function like a normal heroic army. The series has enough comedy and visual weirdness that even serious groups can become part of the contrast.
The anime will likely use Rebellion to expand the story after the initial rescue setup.
The Visual Experiment Is the Main Attraction
Thunder 3’s most distinctive feature is its visual experiment.
The story does not only tell viewers that the characters have entered another world. It makes the other world look like another kind of artwork.
The protagonists’ designs are simple, round and cute. The multiverse world is detailed, realistic and often intimidating. That difference creates a constant feeling that the children do not belong there.
This is more than a gimmick.
It reinforces the story’s themes. The Small 3 are small, ordinary and out of place, but that out-of-place quality may be exactly what makes them powerful. They are not native to the multiverse, so they do not operate by its normal logic.
The anime’s success will depend heavily on whether viewers accept that visual contrast as part of the narrative rather than a technical flaw.
Why Thunder 3 Feels Different From Other Isekai Anime
Thunder 3 can be described as isekai, but it does not feel like the usual version of the genre.
The protagonists are not reincarnated. They are not summoned by a kingdom. They do not receive fantasy job classes or become adventurers in a medieval world. They stumble into another universe through a mysterious disc and a television screen.
The world they enter is not a warm fantasy setting. It is a sci-fi battlefield with aliens and technology.
The main goal is also personal rather than heroic at first. Pyontaro and his friends are not trying to defeat a Demon Lord or conquer a dungeon. They are trying to find Futaba.
That gives Thunder 3 a different flavor. It blends isekai structure with hard sci-fi aesthetics, superhero powers, childhood adventure and meta-comedy.
The Anime May Divide Viewers, and That Is Part of Its Identity
Thunder 3 is not designed to look or feel conventional.
Some viewers may be immediately drawn to its bizarre contrast between cute characters and realistic sci-fi environments. Others may find the mix strange, especially if they expect a more traditional anime visual style.
That divisive quality may actually help the series.
In a crowded anime season, many shows fight for attention by following familiar formulas. Thunder 3 stands out by being difficult to categorize. It is school comedy, sibling rescue story, multiverse sci-fi, alien action series, superhero parody and visual experiment all at once.
That kind of bold identity can create strong reactions.
Even viewers who are not sure whether the style works may remember it, and for a new anime, memorability is already a powerful advantage.
Why the Trailer Matters After Episode 1
The timing of the new main trailer is interesting because it arrived after the first episode had already revealed the show’s core twist.
That means the trailer can show more of the multiverse without completely spoiling the first surprise for people who already watched the premiere. It functions as a second hook: now that viewers know this is not only a school comedy, the trailer shows how much bigger the story becomes.
The trailer also reassures viewers that the anime will continue escalating after the opening episode.
The official announcement says that from Episode 2 onward, the battle action and story development will heat up even more in the multiverse world. That suggests the first episode is only the doorway. The real scale of Thunder 3 begins after the Small 3 step through it.
What Has Not Been Revealed Yet?
Because Thunder 3 has already premiered, many core details are now known, including broadcast schedule, streaming platform, staff, main cast and theme songs.
However, some larger story details are still being held back.
The full nature of the multiverse has not been completely explained. The alien forces, Rebellion’s role and the reason the Small 3 can use powers in the other world remain major questions for the anime to explore.
The season’s total episode count is not listed in the official materials reviewed here. The long-term adaptation plan also remains unclear, including how much of Yuki Ikeda’s manga the anime will cover.
For now, the anime is building curiosity through mystery rather than explaining everything immediately.
Why Thunder 3 Is Worth Watching
Thunder 3 is worth watching because it offers something genuinely unusual.
It is not only another portal fantasy. It is not only another alien invasion anime. It is not only another middle school adventure. It is a collision of all those things, presented through a visual style that makes the collision impossible to ignore.
The story has a simple emotional foundation: Pyontaro and his friends need to rescue Futaba.
But around that simple goal, the anime builds a strange world full of aliens, multiverse logic, alternate Shibuya, resistance fighters and children who suddenly become powerful in a place where they should not belong.
For viewers tired of predictable genre formulas, Thunder 3 may be one of the season’s most interesting experiments.
It may not be for everyone, but it is clearly trying to be memorable.
When Did Thunder 3 Premiere?
Thunder 3 premiered in Japan on July 8, 2026, and is streaming on Netflix.
The anime airs through Fuji TV’s +Ultra block and features animation production by UNEND. Hiroyuki Seshita serves as chief director, Keisuke Ide directs, Koji Seko handles series composition and script, and Yuki Ikeda’s manga provides the original story.
The main cast includes Sayumi Suzushiro as Pyontaro Tezuka, Natsumi Kawaida as Tsubame Azuma, Eri Akiyama as Hiroshi Ochanomizu and Honoka Mitsubachi as Futaba Tezuka.
The new main trailer and visual push the series deeper into its multiverse conflict, showing the Small 3 facing alien forces, massive weapons and a world where normal logic no longer applies.
Pyontaro, Tsubame and Hiroshi may be ordinary kids in their own world.
But in the multiverse, only the Small 3 can save Futaba.
And maybe much more than that.
