In the near future a pandemic spreads around the world, so people hiding their mouth with a mask has become the norm. Natsuki, a girl who is secretly reminiscent of the world before the pandemic, and Hata, h...

In a country very much like present-day Japan, governed by an emperor who rules with an iron fist, a dark disease known as "BT" is spreading out-of-control. All those infected with BT will be overtaken by an...