Kenta left his parents' home and spent three years at school in a dormitory. That life will soon come to an end. After the graduation ceremony, while walking to school with a friend and reminiscing about old memories, a beautiful woman appears in front of Kenta. It is his father's new wife and stepmother, Nanako. Nanako has come secretly to celebrate with Kenta, and she is more like a woman he admires than a mother. Kenta ends up celebrating with Nanako alone, but she gets so excited that she drinks too much and gets drunk, so Kenta ends up taking her back to the hotel where she is staying...