Makoto lives his school life while living in the dormitory. - The three fulfilling years came to an end in the blink of an eye, and the graduation ceremony was finally upon us. - At his parents' house, the woman he admired, Mariko, had remarried his father, so he almost never went home because of the awkwardness. - However, on the way home, Mariko, who has now become his mother-in-law, suddenly visits to celebrate his graduation. - That night, at her accommodation, she gently kissed him and said, ``This is a present for Makoto-kun, who has grown up.'' - Guided by his stepmother, whom he admires, he climbs the stairs to adulthood yet again...