戯言シリーズ

An unnamed nineteen-year-old narrator known only by nicknames like Ii-chan accompanies his friend, the reclusive computer genius Tomo Kunagisa, to Wet Crow's Feather Island, the private retreat of the exiled heiress Iria Akagami. Iria has gathered a handful of brilliant specialists at her isolated mansion, among them a chef, a fortune-teller, and a scholar. Then one of her guests, the painter Kanami Ibuki, is found beheaded in her studio, Iria refuses to involve the police, and Ii-chan is left to pick apart a locked-island murder among people who are all hiding something.