A group of three female college students stay at a hot spring inn on their graduation trip. They think it's just a normal inn, but when they try to enter the open-air bath, they are suddenly raped by the staff! However, when they realize it, they have gone back in time to before they entered the bath... Only the woman who was creampied has a vague memory, but this time when she enters the indoor bath, she is raped again, and they time-leap back to the original guest room... And the girls continue to be raped over and over again for the rest of their lives...