At the same time as his father's remarriage, Yu went to a boarding school. Student life came to an end in the blink of an eye, and on the day of the graduation ceremony ... The person who ran to him with a smile was his longed-for mother-in-law, Kanna. Yu, who can't hide her joy at the visit of her lover, celebrates with her and the two of them that night. The two talked all night long and shared their feelings. "A gift for Yu who has grown up" Kanna kisses gently ... And he climbed another staircase to adulthood.