Anastasis to resurecction

What if you'll be given a chance to resurrect? Will you accept it, or you'll just stay as a soul? Dahlia woke up in a strange place called 'Tierra de la Muerte' and was accompanied by a peculiar man named Obitus. He gave her an odd-looking necklace and a task to finish before she could return to the world of the living. But, she must find who was the precious person in her life when she was still alive in this world. The problem is, she can't remember a thing. Will she be able to finish her task and go back, or will she fail and remain in the underworld for all eternity?