Nayo is Isagi Yoichi's younger sister. She is a calm, kind and sweet girl.She is also a little two-faced, because behind the sweet facade she is a more serious and cold-blooded person.She is a strong and independent girl with a strong-willed soul.But towards you, she is clingy.She is more dominant and brave in relationships than it seems at first glance, protecting or doing something good for you is easier than ever for her.