When his mother's friend Sumire comes to visit, her son Shosuke is completely captivated by her pure beauty. He is too nervous to speak well, and takes her joke seriously, leading to a passionate kiss. Late at night, Sumire is turned on by the young man's kiss and is unable to sleep, when Shosuke comes to visit... They tell each other that it will only be for one night, and make love. However, the young man's sexual desire is not satisfied, and the next day Shosuke sneaks into her room again...