As she lies awake that night while spending the night at Yukino's, Tsubasa realizes she is being selfish, wanting her father all to herself and in the morning, she accepts the engagement. At a formal dinner, she meets her attractive future step brother, Kazuma, who is the same age as she is, but when he mistakes her for an elementary school student, she loses her temper. A few days later, they meet by accident and spend the afternoon together before going to Kazuma and his mother's apartment. At the end of the evening, she tells her father that she approves of the marriage, and they get married the next day.