Beast Within

"We all have a Beast within us. Everyone has a second personality and that is their beast. But what humans call, Demons." Ryuu said, his purple eyes peering down at me. "And the one you show, is a facade."
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Having lived most of his life without a father, Tetsuki Seiko lives with his mother and sister. He is a normal Human with a good high-school life. He tries to be as kind as he can to everyone, although he's not sure if it's on purpose or not since he's somewhat of an air-head.
He is met with an ill fate when he falls down a misplaced well. Only to find himself in a new world, where Humans are extinct.
Running from the many Monsters trying to kill him, he has no one to rely on. Until he meets face-to-face with a Werewolf, accompanied by a Sub-Neko. Falaon, the large Werewolf, accepts him, more-or-less. But Bie, the Neko, has a few problems from his past dealing with Humans.
Tetsuki now has a life of problems, one being Bie and the other being the people trying to kill him. The only protection he has is Falaon, but Falaon is gone on a daily basis. Leaving Tetsuki to practically fend for himself. He has to learn how to survive in a new World and figure out, that you can not trust or spare anyone. You must become a monster yourself.

WARNING: Violence, blood, gore, slight language