Kamonohashi Ron no Kindan Suiri

Ron Kamonohashi's Forbidden Deductions

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Alternative Titles

Synonyms: Ron Kamonohashi: Deranged Detective
Japanese: 鴨乃橋ロンの禁断推理
English: Ron Kamonohashi's Forbidden Deductions
More titles


Type: TV
Episodes: 13
Status: Finished Airing
Aired: Oct 2, 2023 to Dec 25, 2023
Premiered: Fall 2023
Broadcast: Mondays at 22:30 (JST)
Licensors: None found, add some
Studios: Diomedéa
Source: Manga
Genres: ComedyComedy, MysteryMystery
Themes: Adult CastAdult Cast, DetectiveDetective
Demographic: ShounenShounen
Duration: 24 min. per ep.
Rating: PG-13 - Teens 13 or older


Score: 7.451 (scored by 3704737,047 users)
1 indicates a weighted score.
Ranked: #20492
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #1856
Members: 116,747
Favorites: 806

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Ranked #2049Popularity #1856Members 116,747
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Episodes: /13


Ron Kamonohashi, the best student in the history of the elite Detective Training Academy BLUE, has been living as a recluse since BLUE expelled him five years ago. Moreover, he is forbidden to work as a detective, having barely escaped execution after getting involved in a murder case while he was still attending the school. Ron's situation changes drastically when police detective Totomaru Isshiki, following the advice of a senior colleague, seeks him out for help with a criminal case that has remained unsolved for months. Ron reluctantly agrees to help Totomaru and uses his phenomenal intuition to discover the culprit in less than a day. However, it appears that Ron suffers from a mysterious condition that can cause those around him to lose their lives. To Ron's great surprise, Totomaru manages to save the life of someone whom Ron put in jeopardy.

As the unlikely duo starts solving crimes one after another, BLUE sends operatives after its former student to find out if he has resumed investigative work. Fighting against murderers, rogue detectives, and the Metropolitan Police Department, Ron and Totomaru must join forces if they want to survive and see justice prevail.

[Written by MAL Rewrite]


Kamonohashi Ron no Kindan Suiri was released on Blu-ray and DVD in three volumes from January 24, 2024, to March 27, 2024.

Related Anime

Characters & Voice Actors



Opening Theme

Apple Music
Amazon Music
Youtube Music
"Ikenai fool logic (いけないfool logic)" by UNISON SQUARE GARDEN

Ending Theme

1: "Ikenai fool logic (いけないfool logic)" by UNISON SQUARE GARDEN (eps 1)
2: "Lip-sync (リップシンク)" by hockrockb (黒子首) (eps 2-)


Feb 18, 2024
Promising Detective Anime

Looks good the synopsis. Always enjoy detective or cop anime where slice of life and comedy mixed well. Hope this is the case too.

Another good thing about this cop or crime anime is the cases being showcased in the series. This breaks the monotonous feel of the series. The only thing constant is the development of the partnership plus a few supporting characters namely the chief of the investigation section 1.

By the end of the series, you most likely would like to have another series to see how the partnership went. And hopefully the studio will grant that wish.
Feb 25, 2024
Mixed Feelings
I think this'll be the shortest review I've written. Therefore, "Kamonohashi Ron no Kindan Suiri". If I consider this as a comedy and detective - it was quite good, I laughed a lot and tried to guess the mysteries with them (sometimes even simultaneously guessed which imo is not an advantage for the series of this genre). The art is beautiful (I'm just a fan of handsome feminine men and bossy women). The OST is good. And the plot smoothly adds some main mysteries we still have to solve in the season 2.

However, was it worthy of my time? Not sure.

Would I recommend you ...
Mar 18, 2024
Preliminary (8/13 eps)
I can't. Simply can't continue watching this to the end. And I really tried, even paused it couple of times to give it time to simmer and settle down. But no. Nothing helps. Even though it's nicely animated it's irritating to a point of annoyance hardly described by words.

One would think this is a detective and mystery show, but you'd be wrong. There's no detection here. Every episode is formatted the same way where something would happen, then bunch of screaming by everyone involved, guy supposedly not allowed to think thinks and then proceeds to explain to everyone how it happened through his annoying equally ...

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Recent News

'Kamonohashi Ron no Kindan Suiri' 2nd Season Announced

'Kamonohashi Ron no Kindan Suiri' 2nd Season Announced

The 13th and final episode of Kamonohashi Ron no Kindan Suiri (Ron Kamonohashi's Forbidden Deductions) announced a second season for the television anime follow...read more

'Kamonohashi Ron no Kindan Suiri' Announces Additional Pair of Cast

'Kamonohashi Ron no Kindan Suiri' Announces Additional Pair of Cast

The official website of the television anime adaptation of Akira Amano's Kamonohashi Ron no Kindan Suiri (Ron Kamonohashi: Deranged Detective) manga announced t...read more

Recent Forum Discussion

Poll: Kamonohashi Ron no Kindan Suiri Episode 13 Discussion ( 1 2 )
Stark700 - Dec 25, 2023
61 repliesby Devonnius »»
Apr 7, 9:26 PM
Poll: Kamonohashi Ron no Kindan Suiri Episode 1 Discussion ( 1 2 3 )
Stark700 - Oct 2, 2023
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Apr 7, 6:07 PM
Poll: Kamonohashi Ron no Kindan Suiri Episode 2 Discussion ( 1 2 )
Stark700 - Oct 9, 2023
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Mar 25, 5:39 AM
Poll: Kamonohashi Ron no Kindan Suiri Episode 4 Discussion ( 1 2 )
Stark700 - Oct 23, 2023
50 repliesby Starfighter2k »»
Mar 17, 7:02 AM
Poll: Kamonohashi Ron no Kindan Suiri Episode 9 Discussion ( 1 2 )
Stark700 - Nov 27, 2023
69 repliesby nick_el_son »»
Feb 18, 12:43 PM