Mei and Naoya suddenly became family due to their parents' marriage. Mei, a college student, treats Naoya the same way she did when they were kids—cold and indifferent. Naturally, Naoya doesn't see Mei as a woman. However, Mei actually likes Naoya but can't be honest about it because she cares too much about what others think. Gathering her courage, Mei tries to excite Naoya with various excuses and lewd words when they're alone. Gradually, Naoya starts to notice Mei...
