shou, who left his parents' home and entered a boarding school. he successfully completed his studies, and now it's the graduation ceremony. while regretting parting with his friends on his way home, he sees a woman waving and running towards him from across the street... it was hikari, his stepmother, who was supposed to be unable to come. shou, who cannot hide his joy at reuniting with his former crush. that night, shou spends the graduation celebration with just the two of them and sends hikari to the hotel. even at the hotel, the conversation doesn't end and they are having a good time, when hikari suddenly overlaps her lips, saying "a present for shou-kun who has become an adult" -