Reborn as a monster in a monstrous world

An unusually tall thin poor teenager no older than 13 was carrying his violin on his back on his way home. Suddenly out of nowhere an old manhole with number 13 on it. Had given way from his thin ass 40 pounds weight on it! He fell from a 13 meter height. The old manhole was actually an old well. Before he died from the fall he hugged his beloved violin with all his might. By 13 hours later he was found by people and was buried. Yet by those 13 hours he was reborn as a monster in a monstrous world.