One day Kasuga Arata, the demon lord candidate who possesses the "demon lord element", casually touches Asami Lilith's grimoire, the Hermes Apocrypha. At that moment, he is suddenly surrounded by light, and a mysterious young girl shows up in front of him. He gives her the name Lilim, and she becomes attached to Arata and Lilith as her mother and father. But in the same moment…