Dokuso Shi

[Machine Translation] The one-eyed goat was beaten to death by Toshiharu, the previous head of the Onidayama family. Since then, people have been locking themselves up in the house one after another, claiming to have seen the one-eyed goat, and locking themselves inside the house. And then, everyone suddenly disappears from the house. One night, when the police were investigating the disappearance, Hiiragiya, the eldest son of the Onidayama family, was poisoned to death in his room by someone. Moreover, a dying message was left on the spot. When the investigation reached a deadlock, a man named Fumimon Onagata, who claimed to be a "poisoner," suddenly appeared in front of all the parties involved. He compares the series of incidents to "Ise Monogatari" and claims that the case is almost 100% solved... When the secret of the abominable family tradition is revealed, a new murder begins... Fumimon Onagata, the most arrogant and irreverent man in the "QED" series, takes on a difficult case.

鬼田山家の先々代当主・俊春が撲殺した、一つ目の子山羊。以来、この家では「一つ目の鬼を見た」と言い残し、内側から鍵をかけて離れに閉じ篭る人間が相次ぐ。そして誰もが、そこから忽然と姿を消してしまうのだ。密室からの失踪事件として警察が動き始めたある夜、鬼田山家の長男・柊也が、自室で何者かに毒殺される。しかも、その場にはダイイング・メッセージが残されていた。捜査が暗礁に乗り上げた時、関係者全員の前に、突然、御名形史紋という"毒草師"を名乗る男が現れた。彼は一連の事件を『伊勢物語』になぞらえ、事件はほぼ100%解決したと言い放つが…。忌まわしき家伝の秘密が暴かれた時、新たな殺人が始まる-。「QED」シリーズ随一の傲岸不遜な男・御名形史紋が難事件に挑む。