As of July 2026, Ron Kamonohashi's Forbidden Deductions Season 1 aired in 2023 with 26 episodes — streaming now on Crunchyroll. Full episode guide and where to watch below.

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Ron Kamonohashi's Forbidden Deductions Season 1

2023 26 Episodes Animation · Mystery ⭐ 7/10

If you want a crime drama that treats its mystery as more than a puzzle, Ron Kamonohashi's Forbidden Deductions Season 1 is available on and right now. A compact run that never overstays its welcome. Its 7/10 TMDB score, built from 50 ratings, reflects a title that consistently delivers. Yohei Azakami leads a cast that carries the story without ever feeling mechanical. Available now — press play and find out why people keep recommending it.

Part of the current wave of titles people are actually watching, Ron Kamonohashi's Forbidden Deductions Season 1 earns its spot. Ron Kamonohashi's Forbidden Deductions Season 1 treats its mystery as a means, not an end in itself. Season 1 of Ron Kamonohashi's Forbidden Deductions includes 26 episodes. It aired from October 2023 to December 2024. This season stars Yohei Azakami, Junya Enoki and Yoko Hikasa. Yohei Azakami and Junya Enoki lead a cast that brings real weight to the material. It was aired in 2023. The plot mechanics of Ron Kamonohashi's Forbidden Deductions Season 1 never overwhelm the human cost underneath them. It knows exactly what it is, and does not try to be anything else.

Crime and mystery fans will find exactly what they are after in Ron Kamonohashi's Forbidden Deductions Season 1. It has built its own audience without needing a direct comparison. Best experienced as a single, sustained watch if your schedule allows. Yohei Azakami anchors it, but the writing does the real work. If you are going to commit to one crime drama this month, make it this one.

📡 Where to Watch Ron Kamonohashi's Forbidden Deductions Season 1

🇦🇺 Australia

Crunchyroll Amazon Channel

🇺🇸 United States

Crunchyroll Amazon Channel

🇬🇧 United Kingdom

Crunchyroll Amazon Channel

🇨🇦 Canada

Crunchyroll Amazon Channel

🇳🇿 New Zealand

Crunchyroll Amazon Channel

🎬 Ron Kamonohashi's Forbidden Deductions Season 1 — Episode Guide

The Case of the Metropolitan Serial Drownings

The Metropolitan Police Department is struggling to investigate a series of murders, yet Detective Isshiki is ordered to go home. Kiku of the General Affairs Division sends him to meet a certain sleuth—a shaggy-haired eccentric named Kamonohashi Ron.

The Case of the Locked-Room Piggy Bank Theft

Ron is excited to solve cases by using Toto, but he's not on any good ones because his boss thinks he's useless. All he gets are odd jobs and busywork. Ron, however, is quite interested in a new report about coins going missing from a piggy bank...

The Case of the Benizome Hot Spring Murder (1)

Ron wins a pair of tickets to a hot spring in a raffle. Toto accompanies him to stay at the Benizome Inn. The innkeeper who greets them is friendly, but he isn't who he seems. Plus, it isn't long before Ron's eccentricities begin to surface.

The Case of the Benizome Hot Spring Murder (2)

There has been a murder. Ron listens to the other guests' testimonies and begins his deductions. Spitz secretly rejoices at this chance to catch Ron in the act of sleuthing, but outwardly both he and Amamiya entrust the investigation to Toto.

The Case of the Hand Collector

Kawasemi Omito, a supremely skilled detective, leads a joint investigation into a serial killing case. Amamiya lends him Toto, whom Kawasemi deems so useless he's invisible. Ron appears at the newest crime scene as a consultant, irritating Kawasemi.

The Case of the Live Broadcast Murder

Ron loves a certain TV show that puts psychic abilities to the test. During a live broadcast, a psychic claims he can control minds with written words. His neurosurgeon opponent refutes his claims. Then, the psychic writes the word "Death" on a card.

The Case of the Observatory Murder (1)

Toto and Ron are invited to a meteor shower viewing being held on Nandan Island. Also invited is John Grizzly, an instructor at BLUE. There was a murder at the observatory years ago, so the director has brought in first-rate detectives...just in case.

The Case of the Observatory Murder (2)

Ron is named main suspect in a murder and Toto investigates to clear his name. Everyone but Ron has an alibi for the time of the murder, which only seems to cement his guilt, but Toto discovers a few things that cast a new light on the incident.

The Case of the Observatory Murder (3)

Toto gathers everyone together and explains the truth behind the murders. With their name exposed, the culprit takes drastic measures not to be caught, but not before revealing that there's more to this incident than anyone imagined.

The Case of the Poisoned Latte

Toto is shadowed by a reporter who's a huge fan of his for the way he's solved one difficult case after another. They step into a cafe where Ron happens to be working, making things a little awkward. Then, a customer collapses to the ground—poisoned!

The Case of the Mad Chameleon Murder

Toto meets Kawasemi while on a business trip to Aichi. Kawasemi's been in a slump since losing Yamane, and his powers of perception have suffered. He's investigating the Mad Chameleon, who commits a crime right in front of them!

The Case of the Yadagami-sama Murders (1)

Ron agrees to take on Spitz's search request in exchange for his obtaining a file on the Bloody Training Incident. Spitz accepts Ron's terms and takes Ron and Toto to Yadamura, a village in Yamanashi prefecture where his ethnologist brother disappeared.

The Case of the Yadagami-sama Murders (2)

Toto reveals the truth of the case and the culprit admits to their crimes. Ron's disorder triggers, putting the culprit in danger, but help comes from an unexpected source. Who is their last minute savior, and how are they connected to everything?

The Case of the Shibuya Apocalypse Serial Murders (1)

There's been a murder in Shibuya. A man has been found killed in a ghastly and impossible manner. Toto and Amamiya arrive at the scene to find Ron already there. A mysterious message makes them wonder if there's more to the crime than meets the eye.

The Case of the Shibuya Apocalypse Serial Murders (2)

There's been another murder in Shibuya. Shocked by the death, the victim's teammate runs. Ron and Toto race to catch him and find more information on the culprit picking off the hacker team. But the more they find, the more complicated things become.

The Case of the Shibuya Apocalypse Serial Murders (3)

A huge monitor across the street explodes. While Ron and Toto try to make sense of events, Winter tells them that they've lost more than they realize. As Winter torments Ron with the guilt of his failure, Ron realizes that Winter is hiding something.

The Case of the Midsummer Beachside Stand Drowning (1)

Toto suggests that Ron take a rest. They invite Ron's doctor, Usaki Mofu, along and head for a dip in the ocean. Ron looks forward to having shaved ice with black sugar syrup from a beachside stand, but things soon take a tragic turn.

The Case of the Midsummer Beachside Stand Drowning (2)

Ron and the others interview witnesses, but everyone has an alibi for the surfer's estimated time of death. They can't find any concrete evidence that indicates who committed the murder. Then Mofu's usual clumsiness leads to an unexpected clue.

The Case of the Genius Composer Abduction (1)

Ron accompanies Toto to the concert of a super popular artist Nyonyon. After the performance, a card is found in her room. It's from the Talent Abductor, Hummingbird, who has been taking geniuses of all types one after another.

The Case of the Genius Composer Abduction (2)

Nyonyon has disappeared. No matter how much they search the house, there's no sign of her. Sannou presents his personal deductions and concludes that Hummingbird is actually there among them, but Ron spots a hole in his reasoning.

🎭 Cast of Ron Kamonohashi's Forbidden Deductions Season 1

Yohei Azakami

Ron Kamonohashi (voice)

Junya Enoki

Totomaru Ishiki (voice)

Yoko Hikasa

Yoko Hikasa

Amamiya (voice)

Taku Yashiro

Taku Yashiro

Spitz Feier (voice)

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