Ron Kamonohashi's Forbidden Deductions poster

Ron Kamonohashi's Forbidden Deductions (2023)

Animation · Comedy · Crime

Ron Kamonohashi was once regarded as a genius at the top detective training academy. But after a fatal mistake, he was expelled and forbidden to become a detective. Years later, police officer Totomaru Isshiki knocks on Ron’s door seeking help on a serial murder case. He finds Ron, now a messy-haired recluse, who agrees. Together, this mismatched detective team begins solving their first mystery!

IMDb rating: 7.2 (1,174 votes)
Seasons: 2
Streaming (US): Crunchyroll
Language: JA
Type: TV series

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Ratings refreshed Aug 19, 2026 · 2 seasons indexed

Cast

Seasons

Season 1 (2023)

8.01 avg 13 episodes 7.6 → 7.8

Mid-peak

Season 1 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Case of the Metropolitan Serial Drownings	7.6	122
2	The Case of the Locked-Room Piggy Bank Theft	8.1	98
3	The Case of the Benizome Hot Spring Murder - Part 1	8.1	92
4	The Case of the Benizome Hot Spring Murder - Part 2	8.2	93
5	The Case of the Hand Collector	8.0	87
6	The Case of the Live Broadcast Murder	7.9	86
7	The Case of the Observatory Murder - Part 1	8.2	89
8	The Case of the Observatory Murder - Part 2	8.3	84
9	The Case of the Observatory Murder - Part 3	8.5	91
10	The Case of the Poisoned Latte	7.8	79
11	The Case of the Mad Chameleon Murder	7.8	78
12	The Case of the Yadagami-sama Murders (Part 1)	7.8	78
13	The Case of the Yadagami-sama Murders (Part 2)	7.8	77

Season 2 (2024)

8.04 avg 13 episodes 7.9 → 8.6

Season 2 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Case of the Shibuya Apocalypse Serial Murders: Part 1	7.9	48
2	The Case of the Shibuya Apocalypse Serial Murders: Part 2	8.0	46
3	The Case of the Shibuya Apocalypse Serial Murders: Part 3	7.9	45
4	The Case of the Midsummer Beachside Stand Drowning: Part 1	7.4	44
5	The Case of the Midsummer Beachside Stand Drowning: Part 2	7.5	44
6	The Case of the Genius Composer Abduction: Part 1	7.7	44
7	The Case of the Genius Composer Abduction: Part 2	8.0	41
8	The Case of the Psychology Research Lab Murder: Part 1	7.9	42
9	The Case of the Psychology Research Lab Murder: Part 2	7.8	41
10	The Case of the Highland Auberge Serial Murders -- Part 1	8.2	35
11	The Case of the Highland Auberge Serial Murders : Part 2	8.8	31
12	The Case of the Highland Auberge Serial Murders : Part 3	8.8	34
13	The Case of the Highland Auberge Serial Murders Part 4	8.6	31

Ron Kamonohashi's Forbidden Deductions (2023)

Cast

Seasons

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