At the end of the hot summer, I was returning to my parents' home for the 17th anniversary of my mother's death.Every year, no matter how busy she is, she finds a reason to come home because of her older sister, Yuka.Ever since her sister lost her mother when she was a child, she has always looked after me in place of her mother.Both of us are married now, but I've always had feelings for her sister more than siblings.Then, at the end of the memorial service that night, my father called us, and we were told that the two of us weren't really siblings...