Seven years ago, he was linked with his son Shiro at Nishi Nikko. In fact, he had another son, Masaaki Masaaki. Since he was born, he was brought up by senior couple and he was close to Shiro, but he did not know that he was a brother. One day, masaakira, who was raised from his foster parents, was asked to be true mother. Knowing that the aunt of the aunt who was the favorite mother was the mother of the real thing, Masaaki imagined. In order to talk and accept the truth, Nanao decided to go to a hot spring trip with two people.
