On the day of the elections for student council president, Kinshiro Yokuya, Mayumi’s rival candidate and classmate, sits next to her. Before Mayumi’s speech, Kinshiro sets his last trap...! Will the Pretty Boy Detective Club be able to protect Yubiwa Academy?
--It's not like we were arguing.
--We weren't.
--Someday, that night sky that I've been
averting my eyes from quite a while ago...