Also known as: 悪ノ物語
Light novel duology by mothy. A loosely connected spin-off of Evillious Nendaiki set after Master Of The Heavenly Yard (Vocaloid). The first novel is Aku no Monogatari: Kami no Akuma to Himitsu no Shoko, and its sequel is Aku no Monogatari: Tasogare no Akuma to Nisemono no Joou.
Not to be confused with Aku No Musume (Series).