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.
I liked thinking up gimmicks,
،أحببتُ التفكير في الحيل
Ich mag es zwar,
mir Kniffe auszudenken,
Moi, j’aimais penser
aux stratagèmes,
A me piaceva pensare ai vari stratagemmi,
Eu gostava de pensar em truques,
Мне нравилось придумывать 
сюжетные повороты,