The bracelate girls go to a school for witches, all witches have familiars these familiars are part of the girls soul but they can also bind animals to themself's tipically evil witches bind animals without them wanting them to.

The Bracelate girls met the Yu-boys who are animals Yuya is a fox and I haven't thought of the of the others. When witches make a animal be there familar something inportant appears on the familar's body, the boys have the girls bracelates on there arms.