One night. When Takumi Kusamori, an unimpressive young man, is relaxing at home, he is suddenly attacked by light emission. And when the light stopped, there was a dark elf. Dark elf! ?? "Don't you know? Me, mom!" "Eh, yeah yeah !?" The mother, who once died in a car accident, reincarnated in a different world as a dark elf and came back. Takumi, who was confused at first, eventually accepts the reality. Days to pamper as if to redo the lost childhood. Eventually, it started to reach naughty things ... "Maybe I've been separated so far ... You can give your mom as much as you like ...?"