I'm a bored, uninspired salaryman. Every day is the same: wake up, work, eat, drink, and sleep. Until one day, I'm found passed out drunk in the park by a mysterious beauty named Amu. We hit it off and start dating, spending happy times having sex at Amu's place. I thought this blissful routine would last forever. But one day, Amu invites me to a dingy warehouse in a basement. There, I find a group of unfamiliar men. Amu, without hesitation, starts kissing them. Suddenly, an unbelievable reality confronts me. A ritualistic gangbang is about to begin...