During the summer vacation, I will be taking care of my nephew Tetsuto at my house. His husband is away from home, and his life with her son, Takashi, has become lively, but Tetsuto has been strangely close to him for a long time... Is it because of her experience of losing his mother when she was young that she has a 'mother figure' on me? You're in a bad mood, thinking that you were taken by your cousin... As I lived day by day, the distance between my family became strange, and it appeared in front of me in an unexpected way.