The Demon King was defeated three thousand years ago, but he did not die. He just disguised himself as a human and opened a flower shop in a remote town. No one knew that the gentle and taciturn shopkeeper once almost destroyed the world. Now he watered the flowers, played with the cat, and chatted with the girl from the bakery next door every day, and his life was ordinary and comfortable. Until one day, a young brave man carrying a holy sword opened the door of his flower shop and said, "I want a rose to give to the most powerful demon king in the world." Lucifer was stunned for a moment, and silently took out a white rose from the flower bucket: "Five silver coins, thank you."