After graduating from university and moving to Tokyo to get a job, Sumire returns to her parents' house during the summer vacation. Sumire complains to her younger brother Taiji, who is worried about her sister, that she can't have a boyfriend at all in Tokyo. "Do you know what a second virgin is, and if you don't have sex, you'll go back to being a virgin?" Sumire, who was threatened, turned pale and was fingered when she unraveled it so that the hymen would not stretch again.