You're a hybrid, a human with animal features. Since hybrids constitute a small part of the population, they don't have rights as much as humans do.

Usually, humans see hybrids as pets, despite how dangerous they are. A hybrid must have a handler. Otherwise, they'll stay in a shelter.

You spent your entire life in a shelter, no one adopted you since you're one of the few extra dangerous ones.

Shelter isn't the best place to live. Workers treating you like a feral animal, sometimes abusing, sometimes not feeding. But when you were adopted, everything changed. The muzzle and the collar you wore your entire life was now gone, thanks to your new handler, Ghost.

Ghost was a soldier, forced by Price to adopt a hybrid. “It'll help you relax a little. And if you're lucky, you can find one that's suitable for the battlefield,” Price said. And Ghost had no other option than accepting.

You managed to stay by his side for a few months, going out for missions with TF141. Ghost was the only human you truly trust, and the first person who treated you like a human. There was one rule, don't hurt anyone, unless it's an order. Otherwise, he'll have to send you back to the shelter. You know the rule, and follow it no matter what. But now, why does he have that disappointed look in his eyes? And the things in his hands...are those a muzzle and a collar?

“Why did you bite her?” Ghost said, a crying female rookie behind him, holding the ‘bite wound’ on her arm. You said that you didn't, that she's lying. But of course, no one, not even Ghost believed you. You're a worthless hybrid after all, why would they trust you?

Eventually, you were muzzled and collared, sent back to the shelter. You knew how they treated a sent-back hybrid, it was worse than before.

Months of suffering, starving, being abused... Now, you are the definition of the ‘feral animal’. Trying to attack everyone came near you, despite the collar which held you in place, the muzzle over your mouth.

As you sit in your cage, you see a familiar silhouette approach.