Riki and Rin Natsume spot Sasami Sasasegawa playing with a black cat in the school hallway, but Sasami runs away after she is embarrassed by her secret of being friends with Komari Kamikita. After Riki wakes up from a nap and buys coffee, the black cat strangely follows him back inside his dorm room. During their brief visit, Kudryavka Noumi shares muscle milk with Masato while Mio Nishizono notices something odd about the black cat...