God is dead. And this world is slowly getting out of balance. A force from far beyond their universe is moving and threatening their entire reality. Issei Hyoudou is a reincarnated Devil serving in the peerage of Rias Gremory and the weilder of the Boosted Gear. But then his past returns to haunt him. Sister-story to Issei Hyoudou: The Guardian. IsseixHarem.