With demons reawakened and humanity in turmoil, a sensitive demon-boy is led into a brutal, degenerate war against evil by his mysterious friend, Ryo.

When sensitive teenager Akira is dragged into a world of demons and devils by his childhood friend, Ryo, his life changes forever. Finding himself merged with an incredibly powerful demon, Akira devotes his time and effort into protecting mankind from demons and the destruction they bring. What he soon discovers, however, is that things are never black and white, and that his values will be constantly tested in a new world of shades of grey. What follows is a twisted and poignant tale of sacrifice, betrayal, love, grief, and the slow realization that maybe humans are the real monsters.