Mother Chitose sees off her son, who is about to take his entrance exams. Her body soon becomes the target of blackmail by cunning delinquent boys, gradually leading her into days filled with humiliation and pleasure. Thinking of her son, Chitose sacrifices her own body, as they mercilessly rub their young erect penises against her, releasing streams of white urine while pursuing pleasure. As these days continue, Chitose finds herself emotionally consumed by these lewd acts, eventually crossing the forbidden boundary into incest. The story portrays her inner turmoil, the shock and desire she experiences, and the complex emotions she harbors throughout this descent.