Kou Tenjou was once human. Raised in a little village called Futari by an eccentric swordsmith named Tabe Shoukiri, he lived his youth without care, and with much love.

But not anymore.

Now?

Kou Tenjou is the bloodthirsty leader of the Kiri on Paradisia's tallest mountain, given the title of Shuten-douji for his absolute vicious nature, unbefitting of one who once was so gentle.