Kill Blue

Kill Blue (Japanese: キルアオ, Hepburn: Kiru Ao) is a Japanese manga series written and illustrated by Tadatoshi Fujimaki. It began serialization in Shueisha's Weekly Shōnen Jump magazine in April 2023, with its chapters collected in ten tankōbon volumes as of June 2025.

Kill Blue
First tankōbon volume cover
キルアオ (Kiru Ao)
Genre	Action[1] Comedy[2]
Manga
Written by	Tadatoshi Fujimaki
Published by	Shueisha
English publisher	NA: Viz Media
Imprint	Jump Comics
Magazine	Weekly Shōnen Jump
Original run	April 17, 2023 – present
Volumes	10

Plot

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.

Characters

Juzo Ogami (大狼 十三, Ōgami Jūzō)

The main protagonist. He is a 40-year old assassin who is aged back to 12-years old after being stung by a mysterious wasp during a mission. Initially, he didn't like the idea of going back to middle school, but he soon came to enjoy it. His skill with a handgun has earned him the nickname "Demon's Left Hand".

Noren Mitsuoka (蜜岡ノレン, Mitsuoka Noren)

The main heroine. She is 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.

Kotatsu Nekota (猫田 コタツ, Nekota Kotatsu)

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.

Publication

Written and illustrated by Tadatoshi Fujimaki, the series began serialization in Shueisha's Weekly Shōnen Jump magazine on April 17, 2023.^[3][4] As of June 2025, the series' individual chapters have been collected into ten tankōbon volumes.^[5]

Viz Media and Manga Plus are publishing the series in English simultaneously with its Japanese release.^[6] Viz Media began releasing the volumes digitally in July 2024.^[7][8]

Volumes

No.	Original release date	Original ISBN	English release date	English ISBN
1	September 4, 2023[9]	978-4-08-883686-7	July 23, 2024 (digital) June 3, 2025 (print)[8]	978-1-9747-4419-0 (digital) 978-1-9747-5613-1 (print)
1. "Let’s Go to School" (学校へ行こう) 2. "The Wisdom of Others" (爪の垢でも煎じて飲め) 3. "Noren Mitsuoka" (蜜岡ノレン) 4. "You Can't Play Around Like This!" (こんなふうに遊んじゃダメだよ) 5. "Wipe Your Own Butt" (自分のケツは自分で拭け) 6. "Morally Unacceptable" (道徳的に無理) 7. "Middle-Aged Obstinacy" (オジサンは意地っぱり)
2	November 2, 2023[10]	978-4-08-883737-6	October 22, 2024 (digital)[11]	978-1-9747-5068-9
8. "I Ain't Giving You Noren" (ノレンはやれん) 9. "Pacifier Battle" (おしゃぶり決闘) 10. "Midterms and Mama" (中間考査とママ) 11. "And We Came Upon a Unicorn" (行った先には幻獣組) 12. "Sparks on the Soccer Field" (バチバチフットサル) 13. "The Thrill of Futsal" (ワクワクフットサル) 14. "Is It So Hard to Say Thank You?" (ちゃんとありがとう言わんかい) 15. "Conclusions and Propositions" (決着&告白) 16. "Up Against the Wall" (詰んだ)
3	January 4, 2024[12]	978-4-08-883797-0	—	—
17. "Doki Doki Double Date" (ドキドキダブルデート) 18. "Doki Doki Tag Match" (ドキドキダッグマッチ) 19. "Secret's Out" (バレた) 20. "Vs. The Brothers Rindou" (VS竜胆兄弟) 21. "True Experts Wing It" (凄腕は考えない) 22. "Drowsy Noren" (寝ぼけノレン) 23. "No Beating an Unbeatable Game" (無理ゲー事後処理やっぱ無理) 24. "Stark Raving Noren" (暴走ノレン) 25. "Death or Kiss"
4	April 4, 2024[13]	978-4-08-883881-6	—	—
26. "First Hitman Summit" (第一回殺し屋会議) 27. "Don't Pat My Head" (なでるな頭を) 28. "Life Paths" (進路) 29. "Warrin' Noren" (コキノレン) 30. "We're Gonna Do It!" (…行っちゃう?) 31. "Home Ec Club Rides the Waves" (波乗り家庭科部) 32. "Noren's Revelation" (悟りノレン) 33. "Home Ec Club Doesn't Ride the Waves" (波乗れない家庭科部) 34. "Playing at Night When We Can’t Surf" (夜はサーフィンできないから遊ぶんだ)
5	June 4, 2024[14]	978-4-08-884109-0	—	—
35. "The Beach Trip's End" (海合宿完了) 36. "Determined Noren" (決意ノレン) 37. "Mitsuoka Challenge Surfing Battle" (ミツオカ決闘サーフィン対決) 38. "Ladies' Match" (女の戦い) 39. "Fight and Make Up, as Friends Do" (戦って仲直りしたら友達でしょ) 40. "The Disciplinarian and the Killer" (風紀委員と殺し屋) 41. "Stuffies and Evil" (ぬいぐるみと悪) 42. "Sentimental Ogami" (センチメンタル大狼) 43. "Even if This Is the End..." (これで終わりだとしても)
6	August 2, 2024[15]	978-4-08-884129-8	—	—
44. "A Ride on the Hit Man Express" (乗り込め春電バス) 45. "Yoshitsune and Johnny" (ヨシツネとジョニー) 46. "Keep Your Hands Off the Home Ec Club" (家庭科部には手を出すな) 47. "Keep Your Hands Off the Home Ec Club, Part 2" (家庭科部には手を出すな②) 48. "Vs. JARDIN, Round 2" 49. "The Legend vs. The Beast" (伝説VS最強) 50. "The Legend vs. The Beast, Part 2" (伝説VS最強②) 51. "Conclusions" (決着) 52. "Out of the Frying Pan" (一難去って)
7	November 1, 2024[16]	978-4-08-884252-3	—	—
53. "Vacation Home" (別荘へ行こう) 54. "The Mitsuoka Vacation Home Hexagon Manor Murder Case" (蜜岡別荘六角館殺人事件) 55. "The Night Pool & the Sealed Door" (ナイトプールと開かずの扉) 56. "The Mitsuoka Dungeon" (ミツオカダンジョン) 57. "The Mitsuoka Dungeon, Part 2" (ミツオカダンジョン②) 58. "The Mitsuoka Dungeon, Part 3" (ミツオカダンジョン③) 59. "The Mitsuoka Dungeon, Part 4" (ミツオカダンジョン④) 60. "The Mitsuoka Dungeon, Part 5" (ミツオカダンジョン⑤) 61. "On the Outs" (犬も食わない)
8	January 4, 2025[17]	978-4-08-884441-1	—	—
62. "Love Love Album" (ラブラブアルバム) 63. "The End of Summer Vacation" 64. "Cherry Blossom Garden" (桜の庭) 65. "A Meeting with Principal Oka" (桜花×大狼 対談) 66. "Here Come the New Challengers" 67. "Reasons of Their Own" (それぞれの決意) 68. "Cavalry Battle" 69. "Opening Moves" (開戦) 70. "Shin Kohazame vs. Jinta Domeki" (古波鮫シンVS鬼甚太)
9	April 4, 2025[18]	978-4-08-884442-8	—	—
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)
10	June 4, 2025[5]	978-4-08-884562-3	—	—
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" (文化祭エピローグ) 83. "Kakeru Inukai" (犬飼カケル) 84. "Spicy Ginger Ale" (辛口ジンジャエール) 85. "Siscon vs. Tunacorn" (シスコーン対ツナコーン) 86. "Ogami on Offense" (大狼急襲) 87. "Decisive Battle" (決戦) 88. "The End of the Legendary Hit Man" (伝説の殺し屋の最期)
11	September 4, 2025[19]	978-4-08-884654-5	—	—

Chapters not yet in tankōbon format

These chapters have yet to be published in a tankōbon volume.

• 89. "Hate" (大っ嫌い)
• 90. "Meeting Her Father" (挨拶に行こう)
• 91. "Engagement Conditions" (婚約の条件)
• 92. "No Misunderstanding" (勘違いじゃなかった)
• 93. "Noren at the Brink" (テンパりノレン)
• 94. "Middle School Student Council" (六花学園中学校生徒会)
• 95. "Out of Your League" (100年早い)
• 96. "Chisato Shiraishi vs. Juzo Ogami" (白石千里VS大狼十三)
• 97. "Only a Trainee" (見習いだけど)
• 98. "Right Every Time, Some of the Time" (当たるも八卦当たらぬも八卦)
• 99. "Real Mature, Dude" (大人気なくない)
• 100. "You've Got Pluck, Home Ec Club" (いい度胸だぜ家庭科部)
• 101. Sir, Yes Sir!
• 102. "Let the Battle Begin!" (戦闘開始!!)
• 103. "Over My Dead Body" (俺の屍を超えてゆけ)
• 104. "Caught Off Guard" (一泡吹かせてやる)
• 105. "Subaru Ichijo" (一条昴)
• 106. "The Win Is Yours" (君たちの勝ちだ)
• 107. "Naked Camaraderie" (裸の付き合い)
• 108. "Thank You" (ありがとう)
• 109. "Farewell" (さよなら)
• 110. "Counterattack" (逆襲)
• 111. "Mitsuoka Dungeon Battle (ミツオカダンジョンバトル)
• 112. "Don't Sweat the Details" (細けぇことは気にすんな)

Reception

The series was ranked seventh in the Nationwide Bookstore Employees' Recommended Comics of 2024 list.^[20] The series ranked tenth in the print category at the tenth Next Manga Awards in 2024.^[21]

Kaylie Fielden of Screen Rant felt the plot was unique among other hitman manga and praised the beginning chapters.^[2] 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.^[22] Kara Dennison of Otaku USA described the series as "Case Closed with added violence".^[23]