All characters are portrayed by adults. After finishing life at a boarding school, Yu leaves his graduation ceremony with a friend and sees his stepmother Hijiri running toward him with a smile. He has secretly loved her for years and is thrilled to celebrate alone with her. That night, he escorts the unsteady Hijiri back to their lodging after she drinks too much. Accepting his feelings, she gently kisses him and calls herself his gift, leading Yu to take his first intimate step into adulthood.