Yuya is taken in by some rich nobles, they experiment on him and take there frustration/anger out on him the only time they wouldn't have hurt/experiment on him is when he was chained up in his cell do to this Yuya likes to be in chains because it makes him feel safe.

Yoko the queen of a small kingdom has made a group of people who rescue people who are being abused/taken advantage of. All the xyzer's are apart of this group and save Yuya at the age of 14.

Yuya likes to hang out with shay him being a blacksmith. Shay was the first one to notice Yuya preferred to be in chains than not and it helped him calm down do to this Shay takes care of Yuya most of the time teaching him how to speak, read, write and other things.