Dew Frost.Koshiro remembers the birth of his sister and their life together before their parents' divorce. They were too far apart in age to understand each other, and Koshiro's first memories are all about her crying whenever she saw him, to the point where their parents asked if he was bullying her. In the present, Koshiro goes to see his mother Makie for the first time in many years, in an attempt to learn why Nanoka wanted to live with him and Zenzo. She tells him how much Nanoka looked up to her big brother and tells him to be a good big brother to her. He asks what she would do if he did something that made Nanoka's life miserable. After a pause, she answers that if he did she would never forgive him. She puts that aside and resumes asking him to look after Nanoka. On the train ride back, he remembers an incident when toddler Nanoka gave him a glass of mud at the playground, and he ended up keeping it because it made her so happy. When he returns home, he resolves to watch over Nanoka, according to the fate that he is her big brother, and he asks fate that she stop saying she 'likes' him.