In the Sonoda household, a single mother and son struggling to get by, things take a turn as the son, Shinya, grows increasingly distant and cold toward his mother, Yuki. Sensing his emotional withdrawal, Yuki begins to feel an indescribable loneliness. Desperate to close the growing gap between them, she confesses her feelings by kissing him. In that moment, Shinya understands his mother's emotions and, wanting to bridge the distance between them, reciprocates the kiss. As warmth and raw emotion intertwine, their bond deepens once more.