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Juzo Ogami is a 40-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 12. 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.
Publication
Written and illustrated by Tadatoshi Fujimaki, the series began serialization in Shueisha's Weekly Shōnen Jump magazine on April 17, 2023. As of November 2024, the series' individual chapters have been collected into seven tankōbon volumes.
Viz Media and Manga Plus are publishing the series in English simultaneously with its Japanese release. Viz Media began releasing the volumes digitally in July 2024.
These chapters have yet to be published in a tankōbon volume.
71. "Juzo Ogami vs. Hijiri Yatsurugi" (大狼十三VS八剣聖)
72. "Nice One, Ogami!" (ナイスだね!大狼くん)
73. "I Hate You Out of Love" (嫌いだけど好きだから)
74. "Settled" (決着)
75. "Natsukiya and Noren" (夏木屋とノレン)
76. "FuwaCure Fiction" (ふわきゅあふぃくしょん)
77. "Make Me a Themed Cafe, Maggots!" (文化祭だコンカフェやんぞこのやろう)
78. "We're Not Selling Our Souls Here" (別に魂なんて売ってないにゃん)
79. "Full-Throttle Home Ec Club" (全開家庭科部)
80. "Come One, Come All to the Bonus Scramble!" (あつまれ!ボーナス争奪戦!!)
81. "I Will Eat This Tsukemen" (つけ麺を食うのだ)
82. "Culture Festival Epilogue"
83. "Kakeru Inukai"
84. "Spicy Ginger Ale"
Reception
The series was ranked seventh in the Nationwide Bookstore Employees' Recommended Comics of 2024 list. The series ranked tenth in the print category at the tenth Next Manga Awards in 2024.
Kaylie Fielden of Screen Rant felt the plot was unique among other hitman manga and praised the beginning chapters. Robbie Pleasant of Multiversity Comics praised the artwork and characters. Regarding the story, Pleasant felt that it has some worrying elements but nonetheless handled them well. Kara Dennison of Otaku USA described the series as "Case Closed with added violence".