When Mary returns home from Tokyo for the first time in a long time, her younger brother Takashi greets her and is excited to see his older sister's erotic body. Her older sister, who is a bit natural and naive and doesn't doubt others, seems to have been unable to get a boyfriend for a long time in Tokyo, and she takes advantage of this personality and says, ``If we don't have sex for a while, I will call her a second virgin.'' I’m going back to being a virgin,” she lies.