Mei and Naoya suddenly became a family due to their parents' marriage. Mei, a female college student, treats Naoya with the same feeling as when she was a child, so naturally Naoya was not aware of Mei as a woman. However, although Mei loved Naoya, she couldn't be honest because she was worried about her eyes. However, Mei who takes courage and tries to excite Naoya with H words with various reasons when he is alone. Naoya gradually became aware of such Mei ...
