After a divorce, Naoto lives alone with his daughter Kotori, who begins to show a growing need to fill the family void, trying to take her mother's place. As she matures, her feelings toward her father become confused, testing the emotional stability of both of them. Meanwhile, Rina, a shy and inconspicuous classmate of Kotori's, harbors secrets that unexpectedly connect her to her friend's father. Her appearance sparks a series of moral dilemmas and tensions between the characters, revealing an undercurrent of loneliness, desire, and questionable decisions.