Misae Ueki is a 44-year-old housewife. The son she once treated like a child has now become an independent adult, living life on his own terms. As she quietly comes to terms with her role as a mother and breathes a sigh of relief in her daily routine, she accidentally discovers adult magazines in her son's room. The books are filled with themes of MILFs and married women, making it clear that his interests have begun to shift. Though she scolds him out of concern, she gradually notices his gaze turning toward her. Her heart begins to race as she confronts the reality of her son's maturity. A secret relationship unfolds—one she can never reveal to her husband—sparking a forbidden bond between mother and son.