Noboru went on to a local prestigious school and continued living in a dormitory. Three years passed, and finally the graduation ceremony came. On his way home, immersed in memories, his stepmother Maki appeared from behind him with a smile, who had come to surprise him at the graduation ceremony. He enjoyed a celebration alone with the stepmother he had secretly admired, but... Maki drank too much and was taken to a hotel by Noboru. Noboru tried to remain rational so as not to have evil thoughts towards her in her defenseless state. However, Maki gently wrapped her body around his, and he took one step after another on the ladder to adulthood...