Koharu, a schoolgirl, is fitted with a chastity belt and vibrator, enduring intense torment driven by her female teacher's obsessive desire. To remove the chastity device, she must submit to being bound and exposed in humiliating positions. This sadistic extracurricular session powerfully stimulates all five senses, plunging her deep into masochistic enslavement. The intertwining of tension and pleasure in this situation embodies the ultimate ecstasy.