Atsushi and Masa head to the Ushijimas' house to find out the real reason why Ushijima came to see Nina. After a slap in the face, Atsushi and Masa run out of the Ushijima's house. Later, Atsushi meets with Nina and Masa sends a text message to Asami. One day, a boy who claims to be Ushijima's younger brother appears before Atsushi. Atsushi and Ushijima's younger brother, Masa, head to a cafe where Nina is waiting for them. When Nina snaps at his good-natured theory of sexuality, What will happen to Atsushi...?