Noboru went to a local school and continued to live in a dormitory. Three years have passed and the graduation ceremony has finally arrived. On the way home while soaking in memories, it was Maki, a mother-in-law who visited the graduation ceremony with a surprise, who appeared with a smile from behind. I enjoy the celebration alone with my mother-in-law who I secretly admired ... Maki drinks too much and is sent to the hotel by him. Noboru keeps reason not to have an evil feeling for her defenseless girlfriend. However, Maki gently entwined with his body, step by step on the adult stairs ...