On Valentine's Day, popular mystery author Aigasa Kurisu invites Kiyotaka and Aoi to the Shinkokan at the Yoshida-Sanso. But instead of an innocent book reading, they find a group of suspects and a mystery to be solved.
What a Valentine's Day 
this turned out to be.
.يا له من عيد حب
War ein ganz schön
krasser Valentinstag, was?
C’était une piteuse Saint-Valentin.
È stato uno strano San Valentino, eh?
Que dia dos namorados doido...
Ну и День святого Валентина выдался.