Yuu left home to attend a boarding school, and now his student days have ended with graduation. On his way back from saying goodbye to his classmates, he sees his beloved stepmother Ayano waving with a smile. Thrilled to reunite with the woman he has long admired, the now-adult Yuu joins her for a private celebration that night. Ayano drinks too much, so he escorts her to a hotel. Once inside, she gently kisses him and calls it her gift to Yuu now that he is an adult...