Kill Blue

Kill Blue (キルアオ) is a Japanese manga series written and illustrated by Tadatoshi Fujimaki. It was serialized in Shueisha's Weekly Shōnen Jump magazine from April 2023 to September 2025, with its chapters collected in thirteen volumes. An anime television series adaptation produced by Cue (studio) premiered in April 2026.

Plot

Juzo Ogami is a 39-year-old who works for the Z.O.O. assassin syndicate as their prized hitman. During a job taking out criminals working with the genetic manipulation company Mitsuoka Pharmaceuticals, Ogami is stung by a wasp that modifies his DNA, regressing his age to that of when he was 13. Unable to resume work as a hitman due to his stature, the head of Z.O.O. gives Ogami another assignment while they work on an antidote: attend a middle school the head's daughter is applying to and judge if it is safe. Ogami, due to having no formal education, turns out to love middle school, and must balance his time as a student and an assassin. He must also deal with Noren Mitsuoka, the heiress of Mitsuoka Pharmaceuticals, who may be the key to figuring out how to age Ogami back to normal.

Characters

• Juzo Ogami (大狼 十三)
• A 39-year-old assassin who is aged back to 13 years old after being stung by a mysterious wasp during a mission. Initially not liking the idea of going back to middle school, he soon comes to enjoy it. His skill with a handgun has earned him the nickname "Demon's Left Hand".
• Kotatsu Nekota (猫田 コタツ)
• Ogami's partner. Although not nearly as experienced as Ogami, he is skilled with technology, and has more skill in cooking and house care. He created the pair of glasses that Ogami wears that acts as a camera and radio for him.
• Eri Wanibuchi (鰐淵瑛里)
• Ogami's ex-wife who is the head of Z.O.O.'s science department.
• Noren Mitsuoka (蜜岡 ノレン)
• A middle school student and the daughter of Mitsuoka Pharmaceuticals founder. She is constantly hit on by other students, causing her to initially hate men, before befriending Ogami. She helps out her uncle at his ramen shop, and wishes to takeover it when he retires.
• Tenma Tendo (天童天馬)
• Chisato Shiraishi (白石千里)
• Shin Kohazame (古波鮫 シン)
• Kazuma Rindo (竜胆カズマ)
• Eiji Rindo (竜胆エイジ)

Media

Reception

The series was ranked seventh in the Nationwide Bookstore Employees' Recommended Comics of 2024 list.[38] The series ranked tenth in the print category at the tenth Next Manga Awards in 2024.[39]

Kaylie Fielden of Screen Rant felt the plot was unique among other hitman manga and praised the beginning chapters.[40] Robbie Pleasant of Multiversity Comics praised the artwork and characters. Regarding the story, Pleasant felt that it has some worrying elements concerning a possible romance between Ogami and Noren Mitsuoka but nonetheless handled them well.[41] Kara Dennison of Otaku USA described the series as "Case Closed with added violence".[42]

External links