Ayu Anjou

安城あゆ
The second girl who could be Yousukes sister. Compared to Mayus true age she is only a few months younger. She is a Skilled basketball player. Ayu is also very protective of Mayu Her father remarking quotShe is more of a watchdog than a sisterquot upon Yousuke introduced to her. Although she is kind towards Yousuke she does not hesitate to attack him when she thinks he is being a pervert. In chapter two she reveals that Yousuke is just like her brother at the orphanage but she doubts that he really is. source: Wikipedia