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.
Now, if you will, 
this is my theory based on that.
.والآن، هذه هي نظريتي المبنية عن ذلك
Cela étant dit,
Tenendo conto anche di questo,
Agora escutem a minha hipótese a respeito.
А теперь позвольте рассказать 
о моих предположениях.