|Series:||AKB48 Murder Mystery|
|First Appearance:||File 1|
|Last Appearance:||File 5|
|Number of Episode|
|4 (Files 1-2,5 and Testimony File Only)|
One week after Maeda Atsuko's graduation announcement, the 1st Generation members were invited by Acchan to her new office, which surprised Tomochin and the others when they learn that it would be a detective agency. Afterwards, Acchan received a call from their AKB48 manager, confirming the details for her last job as an AKB48 member.
At the island where they would do a CM shoot for Glico's Ice no Mi, Miichan can be seen playing around with Sashiko. After Day 1 of the CM Shoot was done, the members left for the mansion located at another island.
After Acchan returns, all of them heard a scream from the dining area. Prompting them to head there, they found a shocked Sashiko in front of the door. As they turned towards what she saw, Miichan and the Kami8 were shocked to see Kato Rena, drenched in blood, lying on the dining room hall entrance faced down.