A crossover between Love Live! and Diabolik Lovers. When a part-time priest and idol manager approaches Kousaka Honoka and claims that he would help with the activities of Muse's, she agrees naively at once. He says that there will be an idol training in a mysterious and old mansion, and the Muse's sets off, with some members skeptical. However, when they reach there, they find themselves trapped among a group of vampires. With no way to escape and the need to survive, Muse's has no choice but to listen to the vampires' requests... A fanfiction where a group of pure-hearted girls meet two clans of evil and sadistic vampires. Warning: This story may contain details unsuitable for the young.