Based from the original novel from Yukito Ayatsuji tells the story that is set in a dual perspective, one coming from 7 University students who were in a Detective Club and went on an uninhabited island called Tsunojima Island, where the famous "Decagon" house is located and from the mainlands where another two of the club members who did not join the expedition.

This one's like a 3.7 popped up to a 4 by the ending. Speaking of which, crikey! While not the best Japanese crime novel I've ever read, had I been eating something when the big reveal of this story came along, I probably would have choked because of the huge gasp that involuntarily came out of me. As soon as that cleared, the first words out of my mouth were "holy sh*t." I don't have that reaction very often; even though there have been many times I've been truly surprised at the unmasking of the who, this one absolutely takes the cake. This is an isolated-island murder mystery with the clues, red herrings, and so on with climax when readers found whodunit. She follows the monk, and just watches him info dump and piece everything together for the most part.Ayatsuji's brilliant and richly atmospheric puzzle will appeal to fans of golden age whodunits... Every word counts, leading up to a jaw-dropping but logical reveal "— Publishers Weekly The Decagon House Murders ( Japanese: 十角館の殺人, Hepburn: Jukkakukan no Satsujin) is a Japanese manga series, based on Yukito Ayatsuji's novel of the same name, illustrated by Hiro Kiyohara. It was serialized in Kodansha's seinen manga magazine Monthly Afternoon from August 2019 to April 2022, with its chapters collected in five tankōbon volumes. In North America, the manga is licensed by Kodansha USA. Seven members of a university mystery-fan club travel to a desolate island for a week to read, write, and explore the remains of a burned-down mansion where multiple murders were committed not long before. They’re staying in “Decagon House,” which is exactly that: a ten-sided structure that survived the earlier tragedy. But during their first night there, one of the group is killed, and the body left with a grisly reminder of what happened to the island’s ill-fated inhabitants. It will not be the last death during their stay.

The Decagon House Murders is a pale imitation of the novel it is trying to pay homage to. While by no means a terrible read, I found it to be boring and ultimately deeply underwhelming. As the self-proclaimed whodunnit enthusiast that I am, I was looking forward to reading this, especially as it promised to be a playfully meta murder mystery. Rather than reading like a celebration of the golden age crime novel, The Decagon House Murders reads like an incredibly derivative work that is not nearly as clever a novel as it portends to be. He sat down on the cold concrete of the breakwater and faced the expansive darkness, his body veiled by the white vapour of his breath.Ayatsuji’s brilliant and richly atmospheric puzzle will appeal to fans of golden age whodunits… Every word counts, leading up to a jaw-dropping but logical reveal “— Publishers Weekly One might add: 'apparently', to all of the above and much of the below -- predictably, not everything in the novel is as entirely clear-cut as it might (initially) seem.) Slip into an understated and atmospheric COMING-OF-AGE TALE set in a surf community with a seamy underbelly — which is the best kind of underbelly, after all? I recommend this novel for whodunit stories fans. If you don't know Honkaku genre, I recommend to search a bit about it, as what I have been doing for several days. Whilst in the mainland, the mystery of the anonymous sender from the name of a dead man provoked some questions. Are they all just a big coincidence or is it the start of a heinous plan of a crime well-planned?

The earlier deaths loom as a huge shadow over present-day events, but for quite a while The Decagon House Murders proceeds with only hints of menace -- the notes like the one Kawaminami received, or then, on the island, plates arranged suggesting there would be five victims among those present (along with a 'Detective' -- and, ominously, a 'Murderer'). Yoshitame, another early honkaku writer, was working in the 1920s. Writing under the nom de plume Kōga Saburō, he used details from his day job as an engineer to create highly technical plots with a strong scientific slant. (His 1930 story The Spider is an excellent example, and has recently been republished as part of the British Library’s Foreign Bodies anthology.)But about a year ago, the Blue Mansion burned down, killing all the family members. However, the dead people were found to have sedatives, so they are believed to be murdered. To begin, I've been intending to read this book for a long time; I adore Japanese literature, and what better way to sample Japanese fiction than through a honkaku mystery? He had been suffering for months. He had been brooding for weeks. He had been thinking about just one thing for days. And now his mind was focusing on one single, clearly defined goal. The bizarre book begins when the members of the mystery club of a university decide to stay on an uninhabited island. Around 20 years ago, Nakamura Seishi built a Blue mansion and Decagon House, which, as the name suggests, is shaped like a decagon.