Serious and modest college student Honoka ends up becoming roommates with her promiscuous classmate, the gyaru Rikako. Every day, Rikako brings men into their room, having sex repeatedly. At first, Honoka is annoyed, but before long, she becomes drawn to Rikako's moans, her own sense of reason gradually crumbling away. Eventually, Honoka transforms into a shameless, horny bitch herself—fucking Rikako's casual sex partners over and over, climaxing endlessly, completely losing herself to pleasure.