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.
When Suzuka-san started dating Oda-san,
،عندما بدأت سوزوكا-سان تواعد أودا-سان
Suzuka a commencé
à fréquenter M. Oda,
quando Suzuka-san e Oda-san 
hanno cominciato a frequentarsi,
Quando a Suzuka-san começou
a sair com o Oda-san,
Когда Судзука и Ода начали встречаться,