Makoto's student life at a boarding school was about to end soon. And at the graduation ceremony, it was my mother-in-law, Yuka, who came running from the other side of the road with a smile. Makoto, who secretly harbors feelings for her, is excited to celebrate with just the two of them... Yuka takes the plunge and rejects him once when he confesses to him, but is touched by his sincerity and accepts it as a celebration of his graduation. And Makoto climbs the stairs to adulthood again.