A girl named 'Alice' who follows her best friend down into hell, her only aid being a part of Satan when he scattered, desperate to keep corrupting when he lost a fight with an Angel, this piece is Satan's heart and she calls herself Dark. But along the way she realises her own mental instability and tries desperately to stop Dark taking over her completely, because if she does she will just turn into a psycho murderer, which is what Satan wants for his 'little pet', armed with a scythe that Dark gave to her after asking for help to retrieve her friend she has to fight her way through all levels of hell -literally