Aoi, his childhood friend who moved to Tokyo, returns to their hometown and visits his house. They used to be close, but now she mocks him for probably still being a virgin. She says her new boyfriend in Tokyo gave her an aphrodisiac, but she is too afraid to try it with him and asks her childhood friend to be the test subject instead. Once they take it, the drug works far too well, and the two lose all restraint, having sex again and again like insatiable animals.