At that place. The dead yearn for the life of light. The ones alive yearn for the solace of death. That place is Hell! Suderu Koiwa was a normal high school student dealing with routine day-to-day life. Until...

It's an age where aliens, monsters and other dangers threaten the Earth, and various heroes have risen to protect it. Supporting these heroes are the human defense forces, of which the sisters Kitajishi Miyuki...