|Series:||AKB48 Murder Mystery|
|First Appearance:||Umeda Ayaka Testimony File|
|Last Appearance:||Umeda Ayaka Testimony File|
|Number of Episode|
|1 (Testimony File Only)|
- "The three getting killed is a shock, but especially Yuko… With Yuko, when we made the UmeShima NatsuYo team, emulating the way she danced was really fun. And not just dance, but to take Yuko, who is superbly athletic, all the way to the freezer to kill her is kind of a difficult method… This is, so to speak, a premeditated murder, right? If so, what’s the reason behind it?"
- ―Umeda Ayaka's Testimonial[Testimonials and Alibis (src)]
While Mariko's team checks them for Alibis and Yuko's team looks for motives, Detective Maeda processes the scene. Afterwards, the group were called in for a last Handshake Event with Maeda Atsuko. After the event, Umechan, along with Hasegawa Haruna, Ota Aika, Nito Moeno, Nonaka Misato, Uchida Mayumi, and Saeed-Yokota Erena were declared above suspicion because all of them were left-handed.