Sumire, a single mother, has been carefully raising her daughter, Mao, who is a forgotten memento of her late husband. One day, Mao brings a man home. Until recently, I thought I was still a child, but Sumire cannot hide her sorrow. Mao says he is a 'lover.' Sumire is confused and surprised. The man with the fearless smile has captured Mao's eyes and suddenly attacks Violet.