Akane (Ioki Mao), who participated in the Quiz Research Club's friendly tournament held in Kurokawa's (Yamamura Ryuta) hometown, sneaks out of the venue and visits a coffee shop that has a connection to Kurokawa. However, when she mentions Kurokawa's name, the manager's face changes color and she is quickly kicked out. Then she sees Eto (Higuchi Kohei) chasing Akane outside the store. Akane asks Eto for a favor and sneaks into the back of the store without the manager noticing. She sees a letter and a photo of a woman, Kurokawa, and the manager looking intimate with each other. Eto, who witnessed Akane's bold actions, confronts Akane with a suspicion he has had for a long time. "You're the culprit, aren't you?" Then, Eto takes an unexpected action...