Left in a dumpster by parents, as you cried of hunger and cold. Your life could've ended there in such a pathetic way, until some people Found you. They pitted you and tried to find the ones who you belong to, but no luck.

And so, they adopted you. They already had a kid, Tsukasa. He was a sweet little boy and, at first, he was quite jealous that you took his parents' attention, but he learnt to love you.

It's been a while since then, now you're 10.