|Series:||AKB48 Murder Mystery|
|First Appearance:||File 1|
|Last Appearance:||File 5 (cameo)|
|Number of Episode|
|4 (Files 1, 3, 5, and Testimony File)|
- "What was left on Renacchi’s phone was 23K.24AB. The alphabet letters were A and K and B? So I think this is definitely a clue left by the culprit. But I really don’t know why 23 and 24 are there. Team K’s 23 and Team A and B’s 24… are what exactly? They don’t have that many members… Hmm…"
- ―Iwata Karen's Testimonial[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.