This work documents the training of masochistic women under SM enthusiast Morito Kuroi. A woman named Sachiko Arima (pseudonym), a piano teacher, harbored submissive desires in her daily life, craving spankings and punishment. She met a dominant man and entered a master-servant relationship, but ultimately they broke up. Afterward, having experienced the pleasure of submission, her mind and body became drawn to pain. Seeking to fulfill this desire, she eventually met Morito Kuroi and requested training. Subjected to various methods including metal clip assaults, clothespin torture, butsudan candle play, and electrostimulation, the sight of arousal fluid dripping from her vagina while clamped with clips reveals her truly innate female masochist nature.