Kill Blue Uses Science to Shrink an Assassin

Juzo Ogami has spent a lifetime eliminating his targets for the right price. No one escapes his sight, and he always finishes on time. However, a genetics experiment will put his legend to the test by shrinking him down to size. He’s taller than the other shrinking victim, and he hangs out with far fewer cute girls. We’ll see if he can navigate a middle school as well as a battlefield when Kill Blue (Kill Ao) premieres sometime in April 2026.

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Tadatoshi Fujimaki released the original Kill Blue manga series from April 17th, 2023, to September 1st, 2025. Shueisha has since published all thirteen volumes in Weekly Shonen Jump.

Kill Blue Cast

The shrunken assassin, his ex-wife, and his new friend are as follows:

Juzo Ogami — (Older) Shunsuke Takeuchi (Urogi from Demon Slayer: Kimetsu no Yaiba), (Younger) Yuko Sanpei (Ui Ui from Jujutsu Kaisen). Juzu is a legendary assassin with a troubling childhood.
Eri Wanibuchi — Yumi Uchiyama (Puck from Re:Zero -Starting Life in Another World-). Eri is Juzu’s ex-wife and a brilliant scientist.
Noren Mitsuoka — Fuka Izumi (Utena Hiiragi/Magia Baiser from Gushing Over Magical Girls). Noren is Juzu’s new classmate and friend.

Studio Cue maintains a home page, a TikTok channel, and a Twitter (X) page to promote Kill Blue. You can find more information about the series and the key visuals over there.

Kill Blue, Get Good Grades

Juzo Ogami is a peerless assassin. His targets never escape his sight, and he leaves behind only a growing legend. Juzu was pushed into this life of darkness and bloodshed at a young age. As such, he’s never known true peace or a happy childhood. He’ll readily admit that his boring life revolves around his work in the Z.O.O. Assassin Syndicate. Juzo’s most recent job from Z.O.O. sees him eliminate those he thought were simple, irredeemable criminals. However, all is not as it seems, and a wasp sting from one of their nests alters his body at the genetic level.

Juzu has been shrunk, reduced in age from 39 to 13. His ex-wife and head researcher at the Z.O.O. Assassin Syndicate confirm this diagnosis and the source of the genetic manipulation. The gang Juzu eliminated had ties to Mitsuoka Pharmaceuticals and their genetic experimentation, from which the wasp originated. Rather than sit on his laurels and wait for a cure that may not come, Juzu accepts a mission from Z.O.O.’s Boss and begins to attend Rikka Middle School to scout it for the Boss’s potential attendance. It’s there that he meets Noren Mitsuoka, the daughter of the head of Mitsuoka Pharmaceuticals.

Will you brave the rain showers when you watch the premiere of Kill Blue in April? Would you like to be abruptly rejuvenated in age? Could you stand to return to school? Let us know in the comments below.

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