Tomoyuki left her family home and spent her school life alone in the dormitory. Three years have passed in no time, and the graduation ceremony has finally arrived. As I was walking along the last school route with my friend, memories suddenly appeared. A beautiful smile filled with kindness...it was her stepmother Rinko, who had secretly come to celebrate Tomoyuki's departure. Then, Tomoyuki takes Rinko, who has drunk too much and says, "Today is a celebration," to her accommodation, and is led by her admired stepmother and climbs another adult stairs...