Two close female college students, Ichika and Ruru, go on a graduation trip to a quiet hot spring deep in the mountains... but the trip itself is a trap set by Ruru, a jealous friend. Ruru, who lost the man she loved, asks the perverts at the inn for help in humiliating Ichika, and arranges a number of perverted training methods, including aphrodisiacs, gang rape, bondage, and humiliation play...