At 38 years old, Sumire knew she was a true masochist, yet she suffered daily from an increasingly intense, pathological desire to be humiliated. Unable to find satisfaction from her husband due to his age, she struggled more and more to suppress her urges. Then one day, Sumire found herself confronted with the sight of her beloved son, now showing signs of maturity. His presence became the catalyst that stirred something new within her heart.