|Series:||AKB48 Murder Mystery|
|First Appearance:||File 5|
|Last Appearance:||File 5|
|Number of Episode|
|2 (File 5, Testimony File)|
- "I just realized something amazing, Renacchi is in Team 4, Yuko-san is in Team K, Mayuyu is in team B, that just leaves Team A, right? Isn’t this kind of bad?"
- ―Sato Sumire's Testimony[src]
All 89 members of AKB48 went to a duplex island owned by one of Akimoto Yasushi's friends for a CM Shoot. After their first day shoot was over, they went to their designated resthouse on the other island. It was assumed that she heard that Kato Rena was missing and was shocked to learn that the scream they heard was from Sashiko finding the girl's lifeless body in the dining hall.