This Is a Cockroach!.Miki, Aya, and Midori meet each other at school. Miki later notices that their classmate, Shöta Tanoue, is staring at them. Expressing a desire to get to know Aya, he tries to talk to her all day, but is interrupted every time. Midori catches him lingering outside the classroom after class and tells him to go home, but he lies and says he forgot something. When Aya invites Shöta to play with them, Midori teaches everyone how to play a card game called Kakerlakenpoker. During the game, Miki notices Shöta's behavior around Aya...