Okasu Bekarazu!! Junketsu Tokku!

In 2020, a deadly virus was discovered to be slowly killing the human population and threatening the future of civilization. To combat this, people used available technology to undergo "Beast Transformation," a process that introduced animal genes into their bodies, turning them into part-human, part-animal beings. Since all animals were immune to the virus, the transformation became a survival measure. The message became clear: transform or die. By 2035, with the original human species gone, these hybrid beings had become the norm.