Demon's Legacy summary:

Meet our hero, a regular guy in Japan with a bad attitude and not many friends, he lives with his mother, studies history at university and leads a boring and dull life, that is until one day his whole world goes up in flames, literally, he finds out that everything he knew was a lie and now he has to deal with monsters, magic and mayhem. He's got some new powers, but he doesn't know how to use them or where they came from and to make matters worse, he has to find out who his ancestors were and what kind of blood he's got in his veins Sounds like a nightmare, right? Well, buckle up because it's about to get wild!