This work depicts the relationship between mother Sachiko (pseudonym, 48) and her son Ko (pseudonym, 22). It realistically portrays how the strict and dignified mother transforms into a lustful woman through intense BDSM experiences inflicted by her own son. Carefully documenting the hidden side of everyday life, the film powerfully captures her descent as she becomes consumed by forbidden love. This release includes Part 1: "At the SM Hotel for the First Time," whose tension and dramatic progression are key highlights. Witnessing her loss of maternal pride and evolution into a new, submissive self will draw you in deeply.