|Series:||AKB48 Murder Mystery|
|First Appearance:||File 1|
|Last Appearance:||File 5 (cameo)|
|Number of Episode|
|3 (Files 1, 5, and Testimony File)|
- "When Renacchi was a research student, we were understudies for the same position, and she taught me a lot of things, so it’s very painful. Other members who were in the same position? If you look it up you’ll find it right away, but is that a clue?"
- ―Tano Yuka's Testimonial[src]
A few days after Atsuko announced her graduation, the idol group AKB48 went to a far away island to shoot for Atsuko's final project as a member. After the first day of filming, they were told to stay and rest on the island's owner's vacation mansion. As Takamina detailed the chores to be taken care of, and checked on the members, they noticed that, besides Atsuko, Renacchi is also missing. While in the middle of searching for Rena, Tanochan and the rest of them heard from the 1st Gen members that they've already found her.