The Ghoul ascendant

Your standard man witch runs a small shop no family no friends nor lovers all alone in this dark dark world with his only light being manga, anime and novels is taken to God by Truck-nim

God informs him that his small shop will one day save a lot of people in the world so he got a lot of karma points and grants him 4 wishes and a chance to reincarnate

What will happen to our MC?...