A single mother with massive breasts, Izumi Sawada, struggles with her relationship with her beloved son. Her son, unable to wean himself from her breasts, constantly demands them, bringing up "boobs" at every chance. As days go by, he continues to grope her ample chest. One day, he catches her masturbating to relieve her heated body. After that, he persistently gropes her breasts from behind, even while she's doing housework, ignoring her protests of "No, stop it...!!" This depicts her inner conflict, torn between her pride as a mother and her maternal love.