Three years after losing her husband, "Natsuki Aoi" grows increasingly lonely, yet her bond with her biological son "Yuichi" gradually deepens. Torn between her duty as a mother and her growing affection, she finds herself drawn deeper into her son's emotions. As Yuichi falls more deeply in love with his mother, Natsuki Aoi is overwhelmed by her conflicting feelings, yet responds with tenderness and warmth. An intense relationship beyond mere mother-son affection begins to blossom between them, culminating in her expressing these forbidden emotions in the most embarrassing way possible—right before her son.