Mare is a mysterious girl who has the power to summon monsters. Mare comes to a high school looking for individuals with relationships full of envy, hate, anger, and desire, searching for unjust acts and...

It is foretold that every 3,000 years the Choujin, or Overfiend will come. This prophesied being will unite the three worlds of the humans (ninjinkai), demons (makai), and the half-human animal spirits...