第 13 集: 春日發現中村的日記，並提出共同契約以擺脫現狀。

13

Kasuga enters into Nakamura's room. He finds her diary and starts reading it. He recalls what happened. Nakamura comes back, seizes the diary and runs away. He follows her and this time 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. (Source: Wikipedia)