On a summer day when cicadas were loud, I was returning to my parents' house for the first time in a while on the 17th anniversary of my mother's death.The existence of my older sister, Riho, was a big factor in making sure to return every year.She is her much admired older sister who took care of me all the time in place of her mother who passed away early.My sister and I are both grown up and married, but I still have a special feeling for her sister that is different from her siblings.And on the night after the memorial service was over, I was called by my father to talk to him, and I was told that I wasn't a real sibling with her older sister, Riho.