A wolf meets redemption ( Houseki no kuni x male zen Aku reader

In a forest a boy was walking through the forest trying to find a wolf pack to study till he stumbled across a tomb so he entered it and saw a black flute on it he picked it up and took it home when he got home he started to play and all the sudden he hears a voice it kept playing the flute till he saw a mysterious man at the door with a large blade till all the sudden a black wolf like armor came out of nowhere and killed him, you asked him who are you and he was knows as.............................ZEN AKU.