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 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.

Rena pays a visit to Donraku and Kabasawa. Sato tries to tail Dobu to get his stolen photos back, but is caught in the process.

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.

After quitting her detective job, Rena starts working at the same cabaret club as Imai to try and learn about Mystery Kiss's history, and in return she reunites him with a certain taxi driver. Sato learns more about Rena's past.

At the audition, Rena finally gets a chance to talk to Mystery Kiss in person and ask about Mitsuya Yuki, but her probing questions catch Yamamoto's attention. Odokawa enlists Dobu's help to rescue Kakihana.

The body of the real Mitsuya Yuki is found, and all the threads start to come together. Rena confronts Nikaido Rui as she closes in on the truth.

"You gotta do whatever it takes to make your dreams come true." Wadagaki is outdone by Mitsuya Yuki in more ways than one. In the present, Wadagaki and Ichimura are at odds with their feelings on their current popularity and Mystery Kiss's future.

Rena and Sato confirm their suspicions about the motivations of Yuki's true murderer, and race to confront the suspect so they can close the case.