College student Rika Mariri is taken by her lover on what she believes is a hot spring trip, but is instead brought to a remote inn far from civilization. The inn is infamous for voyeurism and orgies, and the man's true intention is to train and dominate Rika. Unaware of his plans, she is forced to masturbate in the car, subjected to bound sex, and made to take part in group sex with complete strangers in the hot springs. Through these degrading experiences, Rika gradually breaks down both mentally and physically, losing her innocence as she falls completely under his control.