Noboru goes to a local preparatory school and continues to live in a dormitory. After three years, the graduation ceremony has finally arrived. On the way home immersed in memories, the one who appeared from behind with a smile was her mother-in-law, Maki, who came to the graduation ceremony as a surprise. She secretly enjoys a celebration with her mother-in-law, who she admires, but... Maki drinks too much and she is sent to a hotel by him. Noboru maintains reason so as not to have evil feelings for her defenseless girlfriend. However, Maki gently entwined with his body, stepping up the adult stairs, step by step.
