[Touken Ranbu] I Escaped the Women's Hell, Only to Fall into a Men's Hell

In 2135, an X-wave decline event swept the globe, leaving all men with no interest in or need for XY.

Three years after this major event, with Japan's birth rate less than 30 percent of what it had been ten years earlier, the government passed a policy legalizing any act as long as pregnancy was possible.

From then on, women began to hunt men, and men were plunged into a terrible disaster...