Was most probably born when Satomi Rio saved Sousuke's life five years ago, but at the cost of splitting his soul in half.<br /> <br /> Ao also holds their childhood memories, which is the reason why the other Sousuke can't remember much.<br /> <br /> Ao seems obsessed with Shino, he likes teasing Shino but maybe that is only a facade to hide his loneliness, because Shino chose to be with his other half, Sousuke.<br /> <br />