Rena attends a Mystery Kiss event to see if Yuki remembers her from their high school days. While continuing their investigation of Odokawa, Sato discovers that the man who beat him up on their first job was the infamous criminal Dobu.

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.