Kindhearted Miyu agrees to spend ten days in a man's apartment to make amends for her brother's mistake. The pleasure awakens a submissive side she never knew she had, and the voluptuous beauty is subjected to a relentless program of humiliation and training. Day one begins with naked vibrator masturbation. On day three, she wears nothing but a collar, gives standing blowjobs and forced deep throat, gets fucked over a table, and takes a thick creampie. Day five brings standing doggy-style sex in the kitchen, while day seven ends with clitoral teasing and orgasms in the bath. By day ten, even the harsh discipline has become pleasurable. Still awkward but obedient, Miyu serves as instructed, arches in pleasure with her huge breasts bouncing, and moans about how good the cock feels before orgasming through another creampie. Told she may finally leave, Miyu faces one last decision...