Nao, a wife who was neglected by her husband and suffered from a sexless, troubled life. One day, her brother-in-law came from the countryside to take the bar exam and ended up staying at their house. Lonely Nao indulged in daydreams about what kind of sex her brother-in-law might have, and while masturbating, she was caught by him. Her brother-in-law, who had been studying constantly without any breaks, lost his reason and approached Nao. Although she initially resisted, saying it was wrong to her husband, her body reacted to his forceful advances, and she became excited by the long-absent penis, crossing the line with Nao...