Takeru Ishiyama is a Japanese eighteen-year-old boy who lives in Korea. Takeru isn't good at anything. He is the opposite of nearly everything that everybody needs to have to become successful in life. He is terrible at studying, doesn't have any leadership in any capacity, always comes up with worthless ideas, failing strategies, and backfired plans. He is best described as extremely lazy and a little bit goofy by his friends and family. However, on one faithful day, he suffered a heart attack that needed to have medical surgery and was unlucky. The surgeon doctor accidentally made a mistake and bisected his heart.

Takeru is supposed to go to the afterlife. Still, he lost that chance when an Omnipotent dark-god, who claims to be the "personification of darkness" but doesn't have any intentions to do evil, pulled him into his realm and said the dark god himself is looking for a successor. Takeru comes to accepts being the successor of the dark-god.

It resulted in him being reborn into a cyberpunk era as a hideous creature that others can only describe as a "demon". In this place, people despise those who are capable of using dark-forces-related powers. This includes those who are also aligned with dark-magic, demons, undead, and Dark-type monsters, including necromancers, who are all considered enemies of humanity, but because Takeru is a dark-god incarnate. He was hunted by society after he was reborn in the new world. Takeru eventually confronts another person that has the same faith as he is. She was a school friend of his and a Korean transfer student that is a skilled athlete chosen by a light-god to carry on their legacy. The two must now survive together in the new world.