Ron Kamonohashi: Deranged Detective
Ja kanji鴨乃橋ロンの禁断推理
Ja romajiKamonohashi Ron no Kindan Suiri
Genre
Ron Kamonohashi
manga
AuthorAkira Amano
PublisherShueisha
ImprintJump Comics+
MagazineShōnen Jump+
FirstOctober 11, 2020
LastJuly 6, 2025
Volumes19
Ron Kamonohashi's Forbidden Deductions
tv series
DirectorShōta Ihata
WriterWataru Watari
MusicYo Tsuji
StudioDiomedéa
Licensee
NetworkTokyo MX, AT-X, KBS Kyoto, SUN, BS11, TV Aichi, TVh, TVQ, SBS Shizuoka
FirstOctober 2, 2023
LastDecember 30, 2024
Episodes26

Ron Kamonohashi: Deranged Detective (鴨乃橋ロンの禁断推理, Kamonohashi Ron no Kindan Suiri, lit. 'Ron Kamonohashi's Forbidden Deductions') is a Japanese web manga series written and illustrated by Akira Amano. It was serialized in Shueisha's Shōnen Jump+ from October 2020 to July 2025, with its chapters collected into 19 tankōbon volumes as of October 2025. Shueisha also simultaneously publishes the series in English on the Manga Plus online platform.

An anime television series adaptation produced by Diomedéa aired from October to December 2023. A second season premiered in October 2024.

Premise

The series focuses on the adventures of Ron Kamonohashi, an eccentric private detective, and Totomaru Isshiki, an unskilled police officer, as they solve crimes together.[3] Five years ago, Ron was the top student at the Detective Training Academy Blue. However, after being found responsible via temporary insanity for a deadly incident known as the "Bloody Field Trip", his detective license was revoked and he was expelled. Unable to fulfill his only love of solving mysteries, Ron has lived in isolation since. When Totomaru seeks his help on a case, the two form a partnership where Totomaru takes the credit for the cases that Ron solves.

Characters

Main characters

Ron Kamonohashi (鴨乃橋 ロン, Kamonohashi Ron)
[4]
[5]
A sixth-generation descendant of Sherlock Holmes, and a ninth-generation descendant of James Moriarty. His detective license was revoked five years ago following the "Bloody Field Trip", an incident he cannot remember. Whenever he hears a murderer confess their crime, Ron enters an uncontrollable state where he pressures and convinces them to kill themselves.
Totomaru Isshiki (一色 都々丸, Isshiki Totomaru)
[4]
[5]
A police detective in the Metropolitan Police Department who gains some renown by taking credit for the cases that Ron solves. Ron calls him by the nickname "Toto" (トト).
Amamiya (雨宮)
[6]
[5]
Totomaru's boss in the Metropolitan Police. Although usually cold and serious, she has a crush on Ron, whom she thinks is named "Kamoo" (鴨夫).
Mofu Usaki (卯咲 もふ, Usaki Mofu)
[7]
[5]
A renowned neurosurgeon who is extremely clumsy outside the operating room and is always wearing bandages due to her injuries. She concocts a combination of medicines to suppress Ron's "culprit-killing" syndrome, but there are side effects.
Omito Kawasemi (翡翠 臣疾, Kawasemi Omito)
[7]
[5]
A pedantic detective from the Aichi Prefectural Police. He has the highest number of solved cases in the entire country and is an old colleague of Amamiya.
Chikori Monki (門季 チコリ, Monki Chikori)
[8]
A crime reporter who often helps Totomaru and Ron with research and information gathering. She greatly admires Totomaru and dislikes Ron.
Elmer Stingray (エルマー・スティングレイ, Erumā Sutingurei)
An American who transferred to Blue Academy three days before the "Bloody Field Trip" and claims to have been Ron's friend, although Ron does not remember him. He is revealed to be an assistant to the Holmes family, specifically to Ron's mother, who views him as an adopted son.

Blue

The Detective Training Academy Blue (探偵養成学校BLUE) in England is the world's most prestigious academy for training detectives.

Spitz Feier (シュピッツ・ファイア, Shupittsu Faia)
[6]
[5]
The tracking instructor at Blue, who is sent to investigate whether Ron is violating his detective ban. However, his actual goal is to have Ron help him find his missing brother. Spitz befriends Ron and Totomaru and continues to assist them on various cases.
Fin Fennec (フィン・フェネック, Fin Fenekku)
[9]
The locked room instructor at Blue and one of less than 10 people in the world who have an S-rank detective license.
Shachi (シャチ)
Fin's bodyguard and a graduate of Blue. He attended the academy at the same time as Ron. He is revealed to be the M. Family's informant at Blue.
Hirsch (ヒルシュ, Hirushu)
[9]
The anatomy instructor at Blue. He has been a suspect in 15 murder cases, with one of these instances being the reason he was demoted to A-rank detective.
Emme Emmerich (エメ・エメリッヒ, Eme Emerihhi)[a]
[9]
The principal of Blue and a friend of Ron's parents. She informs Ron of the M. Family's involvement in the Bloody Field Trip incident, though discretely due to there being an M. Family informant at Blue.
John Grizzly (ジョン・グリズリー, Jon Gurizurī)
[9]
[5]
The closed circle instructor at Blue.
Night Bran Jr. (ナイト・ブラン・Jr., Naito Buran Jr.)
The number one student at Blue, son of a vice-chairmen of the World Detective Alliance, and a descendant of the first principal of Blue.
Alyssa Beaumont (アリッサ・ボーモント, Arissa Bōmonto)
The number two student at Blue, who wears a headband with rabbit ears on it.
Hutter Horn (ハッター・ホルン, Hattā Horun)
A top student at Blue, who attends thanks to a scholarship under John Grizzly.
Marsh Leipley (マーシュ・レプレー, Māshu Repurē)
A top student at Blue.

M. Family

The Moriarty Family (モリアーティ家), more commonly referred to as the "M. Family" (M家), is a legendary crime syndicate and the archenemy of the Holmes detective family.

Tiger Dan (タイガ・ダン, Taiga Dan)
[10]
Milo's uncle, whose real name is Daniel Moriarty (ダニエル・モリアーティ, Danieru Moriāti).
Winter Moriarty (ウィンター・モリアーティ, Uintā Moriāti)
[11]
[5]
The fourth child of the M. Family who specializes in disguises. After failing at a mission, Milo has an assassin shoot Winter, but then has doctors nurse her back to health as she survives the attack. After recovering, Winter splits from Milo, whom she never forgave for killing their younger sister Alice.
Milo Moriarty (マイロ・モリアーティ, Mairo Moriāti)
[11]
[5]
The eldest child and head of the M. Family. He killed his younger sister Alice in order to earn that position. After he loses to Ron, Milo is attacked on the orders of the "new boss" of the family. This is later revealed to be Alice, who survived because she tampered with the gun before Milo shot her. "Disappointed" that Milo showed emotion by hugging her and crying after the shooting, Alice plotted to steal the M. Family away from him once she turned 17.
Alice Moriarty (アリス・モリアーティ, Arisu Moriāti)
The youngest child of the M. Family. Initially believed to be dead, Alice first appears in the series under the guise of "Billy Za Gojila" (ビリー・ザ・ゴジラ, Birī Za Gojira), nicknamed "Billy Goji", a top student at Blue who always has various animals on her. She perpetrates a series of murders at Blue, before escaping custody as her true identity is revealed.

World Detective Alliance

Kei Moore Kikuma (菊間・ケイ・ムーア, Kikuma Kei Mūa)
Director of the Japanese Branch of the World Detective Alliance, an underclassman of Ron at Blue, and the son of Kiku, a police officer and friend of Ron.

Media

Manga

Ron Kamonohashi: Deranged Detective, written and illustrated by Akira Amano, began its bi-weekly serialization in Shueisha's online magazine Shōnen Jump+ on October 11, 2020.[12][13] The series ended its first part on April 30, 2023, with the second part beginning on June 4.[14] The second part concluded on July 6, 2025.[15] Shueisha has collected its chapters into individual tankōbon volumes. The first volume was released on February 4, 2021.[16] As of October 3, 2025, nineteen volumes have been released.[17]

The series has been licensed for simultaneous publication in North America as it is released in Japan, with its chapters being digitally launched in English by Shueisha on its Manga Plus service.[18][19]

Anime

An anime television series adaptation was announced on December 18, 2022. The series is produced by Diomedéa and directed by Shōta Ihata, with scripts written by Wataru Watari, character designs handled by Masakazu Ishikawa, and music composed by Yo Tsuji.[20] The series aired from October 2 to December 25, 2023, on Tokyo MX, AT-X, and other networks.[7][21] The opening theme song is "Ikenai Fool Logic" (いけない fool logic) by Unison Square Garden, while the ending theme song is "Lipsync" (リップシンク) by Hockrockb.[22][23]

Following the airing of the final episode, a second season was announced.[24][25] It aired from October 7 to December 30, 2024.[26][27][28] The opening theme song is "Feedback o Narashite" (フィードバックを鳴らして, "Playing Feedback"), by Humbreaders, while the ending theme song is "Labyrinth" (ラビリンス, Rabirinsu), by Hockrockb.[29]

Crunchyroll streamed the series outside of Asia under the title Ron Kamonohashi's Forbidden Deductions.[30] Medialink licensed the series in South, Southeast Asia, and Oceania (except Australia and New Zealand) and is streaming it on its Ani-One Asia YouTube channel for its Ultra subscribers.[31]

Stage play

A stage play adaptation ran from November 1–4, 2024, at the Nippon Seinenkan Hall in Tokyo, and on November 9 and 10 at the Sankei Hall Breeze in Osaka.[32] It was written and directed by Keita Kawajiri, with music composed by Futoshi Arai.[32]

Reception

In June 2021, Ron Kamonohashi: Deranged Detective was nominated for the seventh Next Manga Awards in the Best Web Manga category and placed 14th out of 50 nominees.[33][34][35] The series has been recommended by mystery writers Rintaro Norizuki, Masaki Tsuji and Sako Aizawa, all of whom have topped the Kono Mystery ga Sugoi! list.[36] In a blurb, Aizawa called the series an "authentic mystery manga for the new era" and praised its fast pace, as well as the tricks and logic used to identify the culprits.[36] Ryoko Fukuda of Real Sound compared the relationship between Ron and Toto to that of the straight man and funny man roles in manzai comedy, and said she was looking forward to how the "pop, fast-paced story" would develop.[37]

Notes

  1. ^ Principal Emmerich's given name has been variously spelled in English as "Eme", "Emme", or "Aimee".

References

  1. ^ "ja:天野明氏、8年ぶり週刊連載『ジャンプ+』で開始 ミステリー作品『鴨乃橋ロンの禁断推理』" (in Japanese). Oricon News. Oricon. October 11, 2020. Archived July 11, 2021 at the Wayback Machine. Retrieved July 11, 2021.
  2. ^ Pineda, Rafael Antonio (October 1, 2020). "Reborn!'s Akira Amano Briefly Listed as Launching New Manga". Anime News Network. Archived January 14, 2021 at the Wayback Machine. Retrieved April 6, 2021.
  3. ^ Harding, Daryl (October 11, 2020). "REBORN! Creator Launches New Manga Series Ron Kamonohashi: Deranged Detective". Crunchyroll. Archived November 29, 2020 at the Wayback Machine. Retrieved May 1, 2021.
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  5. ^ "ja:天野明のマンガ「鴨乃橋ロンの禁断推理」岸本勇太・野嵜豊のW主演で舞台化、鈴木拡樹らも出演" (in Japanese). Stage Natalie. Natasha, Inc. June 30, 2024. Retrieved December 29, 2024.
  6. ^ Hodgkins, Crystalyn (July 14, 2023). "Ron Kamonohashi: Deranged Detective Anime Reveals 2nd Teaser Visual, More Cast". Anime News Network. Archived July 14, 2023 at the Wayback Machine. Retrieved July 14, 2023.
  7. ^ Hodgkins, Crystalyn (September 23, 2023). "Ron Kamonohashi's Forbidden Deductions Anime Reveals More Cast, 2nd Promo Video". Anime News Network. Archived September 23, 2023 at the Wayback Machine. Retrieved September 23, 2023.
  8. ^ Hodgkins, Crystalyn (December 1, 2023). "Konomi Kohara Joins Cast of Ron Kamonohashi's Forbidden Deductions Anime as Chicory". Anime News Network. Archived December 1, 2023 at the Wayback Machine. Retrieved December 1, 2023.
  9. ^ Hodgkins, Crystalyn (October 6, 2023). "Ron Kamonohashi's Forbidden Deductions Anime Reveals 9 More Cast Members". Anime News Network. Archived October 6, 2023 at the Wayback Machine. Retrieved October 6, 2023.
  10. ^ Hodgkins, Crystalyn (November 29, 2024). "Ron Kamonohashi's Forbidden Deductions Season 2 Anime Reveals 7 More Cast Members". Anime News Network. Archived November 29, 2024 at the Wayback Machine. Retrieved November 29, 2024.
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  18. ^ Hazra, Adriana (October 11, 2020). "MangaPlus Posts Akira Amano's Ron Kamonohashi: Deranged Detective Manga in English". Anime News Network. Archived October 1, 2023 at the Wayback Machine. Retrieved April 6, 2021.
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  22. ^ Cayanan, Joanna (July 9, 2023). "Unison Square Garden Performs Ron Kamonohashi: Deranged Detective Anime's Opening Song". Anime News Network. Archived July 9, 2023 at the Wayback Machine. Retrieved July 9, 2023.
  23. ^ Loo, Egan (August 12, 2023). "Ron Kamonohashi: Deranged Detective Anime's 1st Promo Video Reveals Ending Song, More Staff, October 2 Debut". Anime News Network. Archived August 12, 2023 at the Wayback Machine. Retrieved August 12, 2023.
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  26. ^ Tai, Anita (March 24, 2024). "Ron Kamonohashi's Forbidden Deductions Anime's 2nd Season Premieres in October". Anime News Network. Archived March 24, 2024 at the Wayback Machine. Retrieved March 24, 2024.
  27. ^ Mateo, Alex (August 15, 2024). "Ron Kamonohashi's Forbidden Deductions Season 2 Anime Premieres on October 7". Anime News Network. Archived August 15, 2024 at the Wayback Machine. Retrieved August 15, 2024.
  28. ^ "ja:鴨乃橋ロンの禁断推理 2nd Season [放送情報]" (in Japanese). Tokyo MX. Archived December 29, 2024 at the Wayback Machine. Retrieved December 29, 2024.
  29. ^ Cayanan, Joanna (August 6, 2024). "Ron Kamonohashi's Forbidden Deductions Season 2 Unveils Theme Song Artists". Anime News Network. Archived August 6, 2024 at the Wayback Machine. Retrieved August 6, 2024.
  30. ^ Mateo, Alex (September 20, 2023). "Crunchyroll Announces Release Schedule for Fall 2023 Anime Season". Anime News Network. Archived September 20, 2023 at the Wayback Machine. Retrieved September 20, 2023.
  31. ^ Hazra, Adriana (October 2, 2023). "Ron Kamonohashi's Forbidden Deductions Anime Streams for Ani-One Ultra Subscribers". Anime News Network. Archived October 2, 2023 at the Wayback Machine. Retrieved October 2, 2023.
  32. ^ Tai, Anita (June 29, 2024). "Ron Kamonohashi: Deranged Detective Manga Gets Stage Play". Anime News Network. Archived October 10, 2024 at the Wayback Machine. Retrieved December 14, 2024.
  33. ^ Loveridge, Lynzee (June 21, 2021). "Voting Opens for Tsugi ni Kuru Manga 2021 Awards". Anime News Network. Archived June 22, 2021 at the Wayback Machine. Retrieved June 21, 2021.
  34. ^ "ja:「次にくるマンガ大賞2021」ノミネート作品発表 ウマ娘、【推しの子】、葬送のフリーレンなど話題作続々" (in Japanese). Yahoo! Japan. June 18, 2021. Archived from the original on July 25, 2021. Retrieved July 11, 2021.
  35. ^ Loveridge, Lynzee (August 24, 2021). "Kaiju No. 8, Oshi no Ko Win Next Manga Awards Web, Print Categories". Anime News Network. Archived August 24, 2021 at the Wayback Machine. Retrieved August 24, 2021.
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  37. ^ "ja:致命的な欠陥のある名探偵？ 謎解きエンタメ『鴨乃橋ロンの禁断推理』が面白い" (in Japanese). Real Sound. July 30, 2021. Retrieved December 29, 2024.