Ron Kamonohashi

Ron Kamonohashi: Deranged Detective (鴨乃橋ロンの禁断推理) is a Japanese manga series written and illustrated by Akira Amano. It has been serialized in Shueisha's Shōnen Jump+ since October 2020, with its chapters collected into 14 volumes as of June 2024. Shueisha also simultaneously publishes the series in English and Spanish for free on the Manga Plus app and website. An anime television series adaptation by Diomedéa aired from October to December 2023. A second season is set to premiere 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found responsible via temporary insanity for a deadly incident known as the "Bloody Field Trip", his detective license was revoked and he was expelled.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.

Main characters

 * Ron Kamonohashi (鴨乃橋 ロン)
 * 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 His detective license was revoked five years ago following the "Bloody Field Trip", an incident he cannot remember.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.
 * 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 His detective license was revoked five years ago following the "Bloody Field Trip", an incident he cannot remember.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)
 * 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).
 * 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)
 * 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).
 * 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)
 * 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.
 * 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)
 * 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.
 * 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)
 * A crime reporter who often helps Totomaru and Ron with research and information gathering. She greatly admires Totomaru and dislikes Ron.
 * 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)
 * 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)
 * 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.
 * 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)
 * The locked room instructor at Blue and one of less than 10 people in the world who have an S-rank detective license.
 * 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)
 * 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.
 * 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)
 * 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.
 * 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


 * Vice Principal


 * Disguise Instructor


 * Schedule Instructor

M. Family
The Moriarty family, more commonly referred to as the "M. Family" (M家), is a legendary crime syndicate and the archenemy of the Holmes detective family.
 * Winter (ウインター)
 * 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.
 * 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 (マイロ)
 * The eldest child and current 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.
 * The eldest child and current 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.

Other characters

 * Older Sister


 * Younger Sister

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. Shueisha has collected its chapters into individual volumes. The first volume was released on February 4, 2021. As of June 4, 2024, fourteen 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 both English and Spanish by Shueisha on its Manga Plus service.

Chapters not yet in tankōbon format
These chapters have yet to be published in a volume.


 * 126. "Target: World Detective Alliance Pt. 2" (狙われる世界探偵連盟②)
 * 127–135. "The Case of the Ferris Wheel Disappearance Pts. 1–9"
 * 136. "The Case of the Tokyo Chimera Serial Murders Pt. 1"

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" (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.

A second season was announced immediately after the end of the first season. It is set to premiere in October 2024.

Crunchyroll licensed the series outside of Asia under the title Ron Kamonohashi's Forbidden Deductions. 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.

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. 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. 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.