Watch Jack Brooks: Monster Slayer

Jack Brooks's parents were murdered when he was young which has caused him to have problems such as anger issues and irresponsibility even as a young adult. People around him have noticed and warned him that he needs to do something about it. While he is doing work for his Professor, he finds that he somehow unleashed an evil spirit that turns his professor into a monster. This spirit also finds itself infecting others and turning them into evil monsters making Jack responsible for being able to stop them. He can not stop them with his anger so he has to find a way to control it so he can end the spread of the monsters.