19-year-old private detective Rena is assigned to train the clumsy new hire Sato. After Sato is attacked on a job, they take shelter in a nearby restaurant, where owner Taeko asks them to investigate an odd taxi driver she knows named Odokawa...

Rena continues to try and uncover the secrets behind Mitsuya Yuki, and recruits Kanon and Sato to help her tail the members of Mystery Kiss. Meanwhile, Kakihana continues to dig himself into a deeper hole.

A look back in time at the events that set everyone on their current paths. Rena's envy for Yuki drives her to a desperate impulse. Manager Yamamoto and Nikaido Rui race to hide a corpse.