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The Decagon House Murders

Name: The Decagon House Murders
Director: Akira Uchikata
Genre: Mystery
Released: 2024-03-22
Rating: 8.7

十角館の殺人

Mystery

Watch Free

We checked 8 streaming services in India on 04 Jun 2026 at 12:32 IST

2024

1 Season

5 Episodes

Ended

About

The drama tells the story of a group of seven university students who travel to a deserted island where a strange decagonal mansion stands. It was the scene of a grisly mass murder six months earlier, and events soon turn ominous.

#based on novel or book#island#serial killer#series of murders#murder case#mystery

Cast

Tomoya Oku

as Takaaki Kawaminami

Munetaka Aoki

as Kiyoshi Shimada

Akihiro Kakuta

as Koujiro Nakamura

Toru Nakamura

as Seiji Nakamura

Ayumu Mochizuki

as "Ellery"

Neru Nagahama

as "Agatha"

Yuki Imai

as "Leroux"

Kosuke Suzuki

as "Poe"

Reia Yonekura

as "Orczy"

Rukiya

as "Carr"

Hiroto Kobayashi

as Kyoichi Morisu

Asumi Kikuchi

as Chiori Nakamura

Mari Hamada

as Kuniko Matsumoto

Tamiyo Kusakari

as Masako Yoshikawa

Yasuyuki Maekawa

as Seiichi Yoshikawa

Aoba Kawai

as Kazue Nakamura

Tetsuhiro Ikeda

as Osamu Shimada

Seasons

Season 1

5 episodes2024

Episodes

Season 1

Episode 1

Mar 22, 202453m

Konan Takaaki, a former member of K University’s Mystery Research Club, receives a mysterious letter from Nakamura Seiji. Determined to uncover the truth, he visits Seiji’s younger brother and meets Shimada Kiyoshi, who soon joins him in investigating the mystery.

Episode 2

Mar 22, 202444m

During a training camp at the Decagon House on Tsunoshima Island, a member of the Mystery Research Club is murdered. As suspicion spreads among the isolated group, Konan and Shimada search for clues related to the earlier Aoyashiki incident.

Episode 3

Mar 22, 202448m

Konan and Shimada continue their investigation but struggle to uncover any solid leads. While they question whether the mysterious letter might have been a prank, a terrifying incident unfolds at the Decagon House.

Episode 4

Mar 22, 202446m

Reviewing the clues they have gathered, Konan and Shimada develop a new hypothesis that could explain the tragedy at Aoyashiki. Determined to uncover the truth, they decide to travel to Tsunoshima Island themselves.

Episode 5

Mar 22, 202449m

As the situation at the Decagon House grows more serious, Konan learns the shocking details of the incident from the police. Devastated by the deaths of his friends, he considers stepping away from the case, but ultimately resolves to continue the investigation and reveal his final theory.

Where does The Decagon House Murders rank today?

The Decagon House Murders is #3024 on the CineFlixo Daily Streaming Charts today.

Highest: #3024
Top 10: 0 days
Top 100: 0 days

Watch The Decagon House Murders Online Free — All Episodes in HD

Looking for a place to watch The Decagon House Murders online for free? You've landed on the right page. The Decagon House Murders is a highly acclaimed Japonés mystery series from 2024 that you can stream right now on CineFlixo in high quality, no signup required.

About The Decagon House Murders

The Decagon House Murders Cast and Characters

The cast features Tomoya Oku (as Takaaki Kawaminami), Munetaka Aoki (as Kiyoshi Shimada), Akihiro Kakuta (as Koujiro Nakamura), Toru Nakamura (as Seiji Nakamura), and Ayumu Mochizuki (as "Ellery"). Their performances are a major reason The Decagon House Murders has built such a passionate audience.

Where to Watch The Decagon House Murders Online

CineFlixo lets you stream The Decagon House Murders online free, instantly, in HD. There's nothing to install — open the page, hit play, done. Works perfectly on Jio, Airtel, Vi networks across India and on slow mobile data thanks to our adaptive video pipeline.

▶ Watch The Decagon House Murders Now

Why People Are Watching The Decagon House Murders

There's a reason The Decagon House Murders keeps showing up on "must-watch" lists. What makes it work is tight pacing that earns its twists. If you enjoy Japonés storytelling that doesn't follow the same tired beats, this is the kind of show you'll end up recommending to friends.

Frequently Asked Questions about The Decagon House Murders

Where can I watch The Decagon House Murders online for free?

You can watch The Decagon House Murders online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.

How many episodes does The Decagon House Murders have?

The Decagon House Murders has 5 episodes across 1 season. All episodes are available to stream right here on CineFlixo.

Is The Decagon House Murders good? What's the rating?

The Decagon House Murders holds a 8.7/10 rating based on 11 reviews — genuinely excellent.

Who is in the cast of The Decagon House Murders?

The main cast includes Tomoya Oku, Munetaka Aoki, Akihiro Kakuta, and Toru Nakamura, plus a strong supporting ensemble.

Is The Decagon House Murders available in Japonés?

Yes — The Decagon House Murders was originally produced in Japonés and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.

When was The Decagon House Murders released?

The Decagon House Murders first aired in 2024.

Do I need an account to watch The Decagon House Murders on CineFlixo?

No. CineFlixo is free and you can watch The Decagon House Murders without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.

Similar Series You Might Like

If you enjoyed The Decagon House Murders, check out Thriller, Puzzle, Beautiful Bones: Sakurako's Investigation, Deliver Me, and IT: Welcome to Derry.

Frequently Asked Questions

Where can I watch The Decagon House Murders for free?

You can watch The Decagon House Murders online for free on CineFlixo. All 5 episodes across 1 season are available to stream in HD without a subscription, signup, or paywall. Just open the show page and press play.

How many seasons and episodes does The Decagon House Murders have?

The Decagon House Murders currently has 1 season and a total of 5 episodes. The series status is "Ended", so the episode count may grow as new seasons are released. You can browse the full episode list on CineFlixo and continue watching from where you left off.

What is The Decagon House Murders about?

In which language is The Decagon House Murders originally available?

The Decagon House Murders was originally produced in JA. On CineFlixo the show is available in its original JA audio. Check the player options on the watch page for available subtitle tracks.

When was The Decagon House Murders first released?

The Decagon House Murders first premiered on March 22, 2024 (2024). The series has since concluded its run.