The Lost Ones Resummon

It was years ago in Cristella.. Kuro, who was 5 then, was out with her butler at the park playing around per usual. Till Kuro heard a small whimper from the bushes. Curious as she was at the time, she went towards the bushes and saw another little girl. Scruffed up and laying on the ground crying. Concerned for the girl and seeing no one around to care for her, they decided to bring her home.
And thus it all began...