After completing his studies at a boarding school, adult graduate Yuu looks back on his school days while walking home from the ceremony. Then he sees Kana, the stepmother he has secretly adored for years, smiling and waving to him. Their reunion rekindles his hidden feelings during a private graduation celebration. That night, Kana gently kisses him and whispers, “A graduation gift from your stepmother...” as Yuu takes another step into adulthood.