Beastfall City

Leo Gao was an orphan until, at six years old, he found himself transported to what seemed like a "parallel world." For twelve years, he lived happily with his loving family of five. But on his eighteenth birthday, Leo discovers a horrifying truth: this is no parallel world; it's a sinister dimension where everyone he's ever known and loved, family and friends alike, are actually monstrous "Beasts" masquerading in human flesh!