Sho has left his family home to attend a boarding school. After successfully completing his studies, he finally reaches graduation day. As he heads home, reminiscing about parting ways with friends, he's surprised to see a woman waving and running toward him from across the road—his stepmother Hikari, whom he never expected to come. Sho's heart swells with uncontrollable joy at reuniting with his former crush. That night, the two celebrate his graduation alone together, and Sho escorts Hikari to a hotel. Their conversation flows endlessly, drawing them closer. Then, Hikari says, "A gift for the now-adult Sho," and suddenly presses her lips to his. This unforgettable moment marks the beginning of something new.