GASSHŌRENKŌ - The Harsh New World

The year is 2494. Out of 9.37 billion humans, only 108 thousand remained, scattered across tight-knit societies in specific places. The cause? A strange disease that turned all of humanity into demonic creatures of myths and legends, in a single day. Enter the State of Japan, the strongest bastion of humanity on the god-forsaken Earth, through the lens of young conscript Hieda Yasumusa as he and his comrades-in-arms take on the threat of the Oni, and try to uncover the answer to the greatest question: When did this happen?