Books (novels and essays) Japanese literature> After school with a mystery

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Japanese literature
For some reason, there are many incidents around Ryo Kirigamine Peak, the assistant director of the detective department of Koigakubo Gakuen High School.
Thieves who have disappeared from the school building, the association between a classmate and the family of poisoned Coffee, and the Field trip UFO Fiasco.
It is refreshing to be eager to solve the problem, but only the gag makes sense and the mystery is developing.
Is it the assistant director of the detective department who presents the famous mystery? What is the ending of the humorous Gakuen mystery?