Ron Kamonohashi
Ron Kamonohashi: Deranged Detective is a Japanese 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 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. 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found responsible via temporary insanity for a deadly incident known as the "Bloody Field Trip", his detective license was revoked and he was expelled.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;Totomaru Isshiki
;Amamiya
;Mofu Usaki
;Omito Kawasemi
;Chikori Monki
;Elmer Stingray
Blue
The Detective Training Academy Blue in England is the world's most prestigious academy for training detectives.;Spitz Feier
;Fin Fennec
;Shachi
;Hirsch
;Emme Emmerich
;John Grizzly
;Night Bran Jr.
;Alyssa Beaumont
;Hutter Horn
;Marsh Leipley
M. Family
The Moriarty Family, more commonly referred to as the "M. Family", is a legendary crime syndicate and the archenemy of the Holmes detective family.;Tiger Dan
;Winter Moriarty
;Milo Moriarty
;Alice Moriarty
World Detective Alliance
;Kei Moore KikumaMedia
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. The series ended its first part on April 30, 2023, with the second part beginning on June 4. The second part concluded on July 6, 2025. Shueisha has collected its chapters into individual volumes. The first volume was released on February 4, 2021. As of October 3, 2025, nineteen volumes have been released.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.
Volumes
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. The series aired from October 2 to December 25, 2023, on Tokyo MX, AT-X, and other networks. The opening theme song is "Ikenai Fool Logic" by Unison Square Garden, while the ending theme song is "Lipsync" by.Following the airing of the final episode, a second season was announced. It aired from October 7 to December 30, 2024. The opening theme song is "Feedback o Narashite", by, while the ending theme song is "Labyrinth", by Hockrockb.
Crunchyroll streamed the series outside of Asia under the title Ron Kamonohashi's Forbidden Deductions. Medialink licensed the series in South, Southeast Asia, and Oceania and is streaming it on its Ani-One Asia YouTube channel for its Ultra subscribers.