by The fourth episode of the Summer 2026 anime Thunder 3, titled “MR. SEGAMI,” aired this week, introducing viewers to one of the series’ most unforgettable new characters—Segami Teiichi.
What begins as an absurd comedy centered around an eye-catching recruitment flyer quickly transforms into a tense survival story set in a world devastated by an alien invasion. The episode’s unique mix of humor, social satire, and shocking violence sparked widespread discussion online, with fans flooding social media with reactions ranging from laughter to genuine surprise.
Comments such as “Help me, F-cup!”, “This plot is completely unpredictable!”, and “I can’t believe it became so serious!” quickly began trending after the broadcast.
About Thunder 3
Thunder 3 is based on the manga by Yuki Ikeda, which began serialization in Kodansha’s Monthly Shonen Magazine in 2022.
From the very beginning, the manga attracted attention for its unusual premise and cinematic storytelling. It was nominated for the Next Manga Award 2022, and its final chapter was published in June 2026, shortly before the anime adaptation premiered.
The story initially follows three elementary school friends known as the “Small Three”:
- Tezuka Pyontaro
- Azuma Tsubame
- Ochanomizu Hiroshi
Their ordinary lives change dramatically after Pyontaro’s younger sister Futaba disappears, leading them into a bizarre multiverse adventure filled with aliens, parallel worlds, and life-threatening battles.
Episode 4 shifts the focus away from the main trio to introduce a completely different protagonist whose perspective dramatically expands the anime’s universe.
Episode 4 Introduces Segami Teiichi
The episode opens on a peaceful morning as university student Segami Teiichi begins his daily workout with push-ups.
Despite maintaining a disciplined lifestyle, Segami has already accepted one harsh reality:
Humanity has lost.
Television broadcasts reveal a terrifying new world where:
- Aliens have conquered Earth.
- Governments have collapsed.
- A mysterious “Great Emperor” now rules in place of world leaders.
- Giant alien robots patrol cities.
- Flying alien craft dominate the skies.
Watching society fall apart, Segami quietly reflects:
“Humanity is being crushed.”
The opening immediately establishes that this is a very different version of Earth from the one viewers have followed so far.
The Mysterious Flyer That Changes Everything
On his way to university, Segami is approached by an attractive young woman wearing a fashionable outfit.
She hands him a recruitment flyer filled with motivational slogans encouraging people to support one another during difficult times.
At first glance, it resembles a suspicious self-help seminar advertisement.
Then Segami notices one particular line:
“Lots of cute girls! Starting from F-cup!”
Everything changes.
His expression instantly shifts.
Online viewers couldn’t stop laughing.
Popular reactions included:
- “His eyes changed immediately!”
- “Don’t fall for that!”
- “That’s the most suspicious advertisement ever!”
- “Apparently F-cups can save the world.”
The ridiculous premise quickly became one of the episode’s biggest talking points.
Comedy Gives Way to Horror
While Segami dreams about finally finding a girlfriend, reality paints a far darker picture.
Outside, enormous alien robots casually destroy buildings, crush vehicles, and kill civilians attempting to resist.
The brutality of these scenes surprised many viewers.
Unlike earlier episodes, Episode 4 openly depicts innocent people being slaughtered by the invaders, emphasizing just how hopeless this version of Earth has become.
Many fans commented that it was the first time the anime fully conveyed the terrifying consequences of the alien occupation.
Facing Death Changes Segami’s Priorities
After witnessing humanity’s desperate situation, Segami reaches an unexpected conclusion.
If the world might end tomorrow…
Then he wants a girlfriend today.
Remembering the mysterious flyer, he scans its QR code and decides to attend the advertised meeting.
Social media loved his straightforward reasoning.
Comments included:
- “His priorities are hilarious.”
- “Honestly… understandable.”
- “The survival instinct works in strange ways.”
Despite the comedy, the decision reflects how ordinary people search for hope in desperate circumstances.
The Main Heroes Barely Appear
On his way to the meeting, Segami briefly passes three familiar faces.
The Small Three appear only for a few moments as ordinary pedestrians discussing Futaba.
Segami recognizes them from videos showing cartoon-like heroes fighting aliens.
Confused but focused on his own goal, he simply continues walking.
Fans immediately noticed the unusual storytelling choice.
Many joked that the protagonists had effectively become background characters in someone else’s story.
A Beautiful Stranger Offers Hope
Arriving at the meeting location, Segami encounters another stunning young woman waiting for the elevator.
To his surprise, she nervously asks:
“Would you like to exchange contact information?”
Segami is completely overwhelmed.
Moments later, several more attractive women greet him warmly.
They compliment his physique, ask about his height, and eagerly request his contact information.
For a brief moment, everything seems too good to be true.
Because it is.
Things Become Extremely Suspicious
Once inside the building, Segami notices several intimidating men.
With shaved eyebrows, sunglasses, tattoos, and frightening expressions, they look more like gangsters than members of a dating group.
The atmosphere changes instantly.
Online reactions included:
- “This is obviously a scam.”
- “Run!”
- “He’s definitely in danger.”
- “That isn’t a self-help seminar.”
Segami himself realizes he may have made a terrible mistake.
Meet Rebellion: Humanity’s Last Resistance
Just as panic sets in, the woman who originally handed him the flyer appears once again.
Her name is Mio Kisaragi.
Offering Segami a rice ball, she gently reassures him that the frightening-looking people aren’t criminals—at least not entirely.
Instead, they belong to Rebellion, an underground resistance organization fighting against the alien occupation.
The group’s members include:
- Ordinary civilians.
- People who lost loved ones to the invasion.
- Former yakuza willing to fight humanity’s final battle.
Among them is the brilliant strategist Kyoji Sumeragi, nicknamed “The Genius.”
When Sumeragi enters another room, he discovers the organization’s impressive arsenal, including rifles, machine guns, and other military weapons.
The episode ends by revealing that Rebellion intends to eliminate every alien threatening humanity.
Voice Actors React to Episode 4
Following the broadcast, several cast members shared their thoughts online.
Ryoko Maekawa (Mio Kisaragi)
Maekawa joked about how Segami followed an irresistible flyer promising beautiful women, only to end up surrounded by intimidating gangsters.
She humorously asked whether Mio could really reassure him that everything would be okay.
Miho Wataya (Reika Makino)
Wataya praised Segami’s constantly changing emotions throughout the episode.
She also teased that Episode 5 would contain even more surprising developments involving Rebellion.
Azusa Aoi (Puusuke / Natsu Aikawa)
Aoi pointed out one particularly amusing detail.
Segami rarely speaks his thoughts aloud.
Instead, viewers hear his nonstop internal monologue, allowing audiences to witness every embarrassing thought running through his head.
Fans Loved the Blend of Comedy and Action
Episode 4 generated widespread discussion online.
Many viewers praised how effortlessly the episode shifted between absurd comedy and genuine suspense.
Popular reactions included:
- “This anime is impossible to predict.”
- “Segami instantly became one of my favorite characters.”
- “The alien invasion suddenly feels terrifying.”
- “I wasn’t expecting this emotional roller coaster.”
- “The F-cup jokes somehow led into a resistance movement.”
The unexpected tonal shifts have become one of the defining characteristics of Thunder 3.
Voice Cast
The anime stars:
- Sayumi Suzushiro as Tezuka Pyontaro
- Natsumi Kawaida as Azuma Tsubame
- Eri Akiyama as Ochanomizu Hiroshi
- Honoka Mitsubachi as Tezuka Futaba
- Shogo Sakata as Doc
- Taito Ban as Segami Teiichi
- Yuki Hirose as Ryoka Tashiro
- Ryoko Maekawa as Mio Kisaragi
- Haruki Ishitani as Kyoji Sumeragi
Production Staff
The anime is produced by UNEND, with the following staff:
- Original Work: Yuki Ikeda
- Chief Director: Hiroyuki Seshita
- Director: Keisuke Ide
- Series Composition & Screenplay: Hiroshi Seko
- Original Character Design: Naoyuki Onda
- Animation Character Design: Junko Yamanaka & Yuki Moriyama
- Production Design: Naoya Tanaka & Ferdinand Patulli
- Music: Frédéric Chateau & Akihiko Tateyama
- Opening Theme: Thunderbolt by Yuri
- Ending Theme: Shururerira by Otoha
Where to Watch
Thunder 3 airs every Wednesday at 12:45 AM (JST) on Fuji TV’s +Ultra programming block.
The series is also streaming exclusively worldwide on Netflix.
Final Thoughts
Episode 4 of Thunder 3 is a perfect example of the series’ unpredictable storytelling.
What begins as a running joke about an advertisement promising “F-cup girls” gradually evolves into one of the anime’s darkest episodes, introducing viewers to the grim reality of an Earth conquered by aliens and humanity’s desperate resistance movement.
Segami’s hilariously honest inner monologue, combined with the shocking reveal of Rebellion, creates an episode that is equal parts comedy, suspense, and science-fiction drama. While the Small Three make only a brief appearance, Episode 4 successfully expands the world of Thunder 3, proving that the anime is far bigger than its original protagonists.
With new allies, dangerous enemies, and a resistance movement now entering the story, fans are eagerly waiting to see how Segami’s journey—and his inevitable meeting with the Small Three—will shape the battles to come.
