(Death) During the war between gods and demons, the last human being was about to die and was discovered by the Beast King, one of the five demon kings. During the demon transformation ceremony, the gods attacked and the ritual was incomplete. The soul of the demon (human body) tore through space and fell into another world thousands of years later. During this period, the soul learns magic from Jeroz in the form of a demon spiritual body, but after the soul and body overlap, it will lose part of the soul's memory. Similar to the Six Paths of Reincarnation, only the knowledge of combat will be remembered. The huge amount of information will cause the body of a 3-year-old to be directly brain-dead, and the protagonist who has lost his soul memory will behave more like a human being. In the dream, the Beast King told her that the complete demon physique requires the protagonist to be "killed" by the demon again. In the ritual of turning a human into a demon, the demon needs to personally kill this person and give him a new energy and life system. This is also the first time for the protagonist. The human body is too weak, so the protagonist needs to find a way to see the demon as soon as possible to complete the ritual. If the demon is too powerful and comes directly to the world, it will directly destroy the world due to the imbalance of the power of the world's rules.