Hajime's father remarried, and while he was confused about suddenly living together, he began to feel somehow attracted to his new partner, Tina.In an attempt to shake off his feelings, Hajime enrolled in a boarding school. And on the way home from the graduation ceremony, which marked the end of my fun student life... It was Tina who was running towards me with a smile on her face. Hajime's heart is excited to be reunited with his secret crush. And on the night he sent Tina away, he kissed her and said, ``This is my present to Hajime-kun, who has grown up.'' Guided by his stepmother, the boy climbs the stairs to adulthood yet again.