A stabbing case where the culprit is still at large. The body was found buried deep in the mountains. you knows who did it. No—you is the one who actually killed. Hoshidori, Koyanagi, and you did it together. Koyanagi, who was begged by Hoshidori, is currently staying at you's place. But then Hoshidori shows up at you's house. What should they do?