Lucifer, an angel who likes fighting and hates losing, spends his day fighting. during his battle with the demon Satan, he was suddenly betrayed by his companions, and he fell into the present age where demons and humans coexist hundreds of years later. Lucifer, who has lost everything including his powers, evolves and is able to copy the abilities of his defeated enemies. Realising this, Lucifer sets out on a journey to seek out more powerful foes.