[Machine Translation] Winner of the Incentive Award in the Young Mystery & Horror Division of the 5th Kadokawa Gakuen Novel Award! This is a work in the popular "Classics Club" series. Bontaro, who is not actively involved in anything, is forced to join the Classics Club by his older sister's order, and he tries to get to the bottom of an incident that occurred 33 years ago involving the uncle of a girl who was a member of the club. This is a coming-of-age mystery about an energy-saving boy and a curious girl.