Mizuho Hanashima is a housewife living with her husband and her only son, Genji. Due to her husband's work, he is rarely at home, leaving her alone with her son for long stretches of time every day. As days passed in this way, she began to see her son not just as a child, but as a man. Unable to express these feelings, she suffered in silence, tormented by her inner desires. Then one day, she saw Genji walking through town holding hands with a girl. In that instant, overwhelming emotions surged within her—feelings that could never be undone.