Meet Mr. white he is the adoptive father that adopted kuro !

And is the running establishment of a place called the WhiteDoor Guild a magical dimensional teleporting restaurant where it chooses special or highly recommend individuals to be part of the Guild. Where these individuals will be learn taught and teach many things but the main goal of the Guild is to train people from other dimensions to live in the beyond a place that doesn't really make sense at first it's a place of illogical so many things confusing ways. So training is very needed and preparing stuff like this is important for individuals to survive in that type of place he tries to make sure everybody's prepared before leaving their former world to live in the beyond.

Even though he's barely on his last legs and falling cracking apart each day his end is probably coming soon.