Isshou Watashi no Joshu de Ite!
一生わたしの助手でいて!
A character who often helps others grows tired of being used and decides to take control of situations. After transferring to a new high school, he reconnects with three girls who were his former detective partners from elementary school. A struggle ensues over who will be the one in charge as the detective. Meanwhile, the girls have developed feelings for him beyond a professional relationship.