Tomoyuki spent his school life alone in a dormitory away from his parents' house. - Three years passed in no time, and he finally reached his graduation ceremony. - As I memorably walked along his last school road with his friend, a woman suddenly appeared. - A beautiful smile full of tenderness ... It came secretly to celebrate Tomoyuki's start with her mother-in-law, Rinko. - Tomoyuki sent Rinko, who had drunk too much because it was a celebration today, to the accommodation, where he was led by his longing mother-in-law and went up the stairs of an adult again.