Saki Ninomiya, a recent graduate, has just started working as a new nurse at a hospital in Tokyo. However, there's a rumor spreading about this hospital: "Nurses quit immediately." Inside the hospital lurks a terrifying dark presence everyone fears, writhing with tentacles that capture each nurse one by one, swallowing them whole. There is no escape. Completely overtaken by the swarm of tentacles, the three women can do nothing but moan as they're forced into endless orgasms. Experiencing every pleasure imaginable—bukkake, creampie, squirting, anal, double penetration—they become unable to leave that place.