the mystery of a girl and her mother who suddenly disappeared behind a shrine during a festival. Because it happened during the festival and near the shrine, people start spreading rumors that it might be something supernatural. Kanna becomes curious and investigates the story, which eventually leads to a connection with a paper merchant. With Chuzenji-sensei analyzing the situation, the mystery is slowly explained in a logical way, showing that the disappearance is connected to human actions rather than something supernatural.