Makoto entered a boarding school at the same time as her father remarried. The fun student life is over, and it's the day of the graduation ceremony. On the way home, where no one should have come, her mother-in-law, Aya, comes running with a smile. Makoto cannot hide her joy at meeting her mother-in-law, whom she fell in love with at first sight. The two celebrate their graduation to make up for the time they spent apart. "This is a gift for grown-up Makoto," said Aya, touching her skin gently. And he climbs another stairway to adulthood.