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.
And why was that?
ولمَ ذلك؟
Warum hat sie das wohl gemacht?
¿Por qué?
¿Por qué?
Et pourquoi donc ?
E come mai, se posso chiedere?
Por quê?
Почему именно тогда?