Being involved in a certain incident, Nonomura Tsukumo became Chiyoda Momose, aka the break up detective's assistant. "Break up detective" chooses the detective reasoning club's activity room as home base. The two's objective is to find out the truth behind their client's break up. Because of the break up detective's rumor spreading around school, more and more clients come to seek their aid.
Solving the lovelorn mysteries, a youthfulness campus reasoning story.