If i go beyond help and became a real demon, will you still love me?

Karito Shinigami, the last and remaining "Good demon" and a "Grim-reaper" finds himself near-death after killing the "Heavenly Heroes" who abused their title and killed millions of innocent lives to those who do not obey them. With his wounds not healing and the curse of the "Heavenly Weapons" Manifesting, Karito hide himself and hibernated for over 20,000 years only to be awoken to the present day by Ai Kibokami, a suicidal girl filled with sadness, anxiety, depression, regret and anger. With the two both in the same boat, the two of them must survive to save the world from the "Heavenly Heroes" who will be "Reincarnated" and will brought chaos to the world once again...