Everything goes downhill when he accidentally meets a girl at a subway which will changes his whole life.

What do you do when somone is trying to change and you think you defeated it?

After literally and figuratively being stabbed in the back by her former friends, Sachiko Salamander takes a bullet to the brain. Finally, "The Two-Faced Salamander" had been put down! ...Or so they all thought. It appears even an extra hole in the head couldn't overcome Sachiko's will to live. Now, with nothing left but scorn and hatred in her heart, Sachiko dedicates the rest of her life to bloody revenge.

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?

So there is this 16 year old boy who is at the very top in martial arts but then one sad night his life takes a very strange turn into the supernatural he now enters in a world of karma

basically its a revenge story so yeah