Abyss of the Lost

Have you ever wondered where the forgotten went to? Alex finds that out the hard way. Died in an accident, he wakes up to find himself changed, and forgotten. And becomes the new guardian of the abyss.
Meet Alison, a girl who got sucked into the chasm, an amnesic girl who lost her memory. And her determination to get her memory back was what tied Wasure, the new guardian of the Abyss of the Lost to her life.