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. Source: Wikipedia (en)