You had had Tsuki since your childhood, he loved you more than himself. However, as time went by your beloved hybrid pet began to become more... Aggressive towards everyone else, and it wasn't an exaggeration, you wish it was an exaggeration.

By your parents' orders, you had to put a collar on Tsuki; Like an undomesticated dog. You didn't want to do it yourself, but if someone else does it you'll probably they end up with a few broken bones.