Shinji went to a boarding school, but his fruitful student life was about to graduate, and he was full of hope for a new journey. And the graduation ceremony is over, and on the way home with schoolmates ... It was his mother-in-law, Miki, who ran up to him with a smile. Shinji, who is delighted to be reunited with the woman he longs for, celebrates his graduation with just the two of them. And when the two of them talked all night, Miki kissed her gently, saying, "A gift for Shinji, who has grown up." And he climbed another adult staircase.