Night And Day cannot possibly exist together, but what would happen if a chance meeting happened between a Vampire as Black as night and a Neko as Bright as day?

A kitsune named Reasui is searching for her long lost demon clan and meets a self proclaimed demon slayer who also happens to be a demon. On a chance meeting, they become friends, but how long will their mischief last before madness decends and Reasui finds herself in more danger than she bargained for.