|Series:||AKB48 Murder Mystery|
|First Appearance:||Testimony File|
|Last Appearance:||Testimony File|
|Number of Episode|
|1 (Testimony File)|
- "Um, this has been bothering me, but Why does the killer change the method of death every time? And then preparing a new weapon every time, I bet it’s really hard. There must be a reason she has to do it."
- ―Iwatate Saho's Testimony[src]
Iwatate Saho (岩立沙穂?), nicknamed Sahhoo (さっほー?), is part of AKB48's Research Students (Team Kenkyuusei). She is one of the primary characters in AKB48 Murder Mystery series. She was based on and was portrayed by Iwatate Saho.
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.