My Guardian Reaper, Vol.1 (Light Novel‪)‬

Lois Devanice was once a slave to achieve one's ambitions. Torment and suffering are always with him and it seems never end until one day, he met this girl that calls herself a reaper that can grant almost all of his desired wishes and who saved him in his verge of death but there's an agreement that must be done between them for her to protect him and serve him. He only desires one thing and that is revenge for those people who are responsible for his miserable life and it isn't new to our ears that in every wish come true, there is always a price to pay. Will his wishes be enough to achieve his goal? Is there a regret in every wish he would make? What is the price waiting for him in every granted wish?