Mei and Naoya suddenly became a family after their parents got married. Mei, who is a college student, treats Naoya with the same blunt, prickly feeling that she had when she was a child, so naturally Naoya doesn't think of Mei as a woman. However, she actually loved Mei Naoya, but she couldn't be honest because she was worried about her eyes. However, with her courage, Mei tries to excite Naoya with lewd words, using various excuses when the two of them are alone. Naoya gradually becomes aware of her Mei.
