Tsukishiro Nina moves to Ruberia, a small country in Europe. But suddenly, she was bitten by Roy, a young Rougarou, a beast that is said to only exist in legends. Once bitten, Nina herself turned into one of them and was forced into "Abigaile" an academy prison on an island where all the beasts are exiled to. What cruel fate awaits the pitiful Nina...!?

Afflicted by a "mysterious illness," high school first year Kuroe has spent her entire life avoiding socializing with others. However, after coming into contact with Minami Arata, the most popular boy in school, something changes--and Kuroe's true powers are unleashed...