A. Maid B. Lieutenant Colonel C. Little Devil

Synopsis

While Mari and Yuki Kozuki work part-time at an Akihabara maid café to buy a buzzer set, Shiki and Inoue are in Akihabara too. They've come to secretly train on a quiz arcade machine. As soon as they start competing against a player called 'Lieutenant Colonel Chisato,' Ashiya shows up. It turns out their opponent was Mikuriya! And then a suspicious figure draws near……