Kasuga goes up the mountains with Nakamura on his bike. They stop because of the rain. Saeki goes looking for Kasuga and finds them. Nakamura undresses him again. When asked to choose between the two of them, he stands his middle ground and upsets both. A police car shows up because of Saeki's parents and brings them all home.

Kasuga writes an essay to Nakamura. Kinoshita asks Kasuga's friends what is wrong with him. Kasuga tries to give his essay to Nakamura, but she ignores him, so he starts reading it to her. She runs away. He goes to Nakamura's house to deliver the essay. On the doorstep, he is invited in by her father, who says that Kasuga is her first friend.

Kasuga enters Nakamura's room. He finds her diary and starts reading it. He recalls what had happened. Nakamura comes back, seizes the diary and runs away. He follows her and catches up to her. This time, he asks her to make a contract with him: they'll do what they can in order to leave for good someday.