The world was as it was, rife with both peace and conflict of every kind. But soon, the world will become a much happier place with no prejudice, fights, or differences.
Instead, everyone will live out their days as happy, horny mouse bois, completely oblivious to their former human lives! This strange cascade will slowly render all of humanity into male mouse anthros, but their bodies will be almost indistinguishable from a cute and sexy feminine body. Everyone will relish in their pseudo-hourglass like bodies, sans the female breasts, wanting nothing more than to live happily on with each other, nibbling on cheese and fucking each other out of friendliness or romance.
Of course, this means females will cease to exist, so no girls allowed! But everyone will be super girly anyways, though no one will tell the difference anyways! Even with everyone becoming girly mouse bois, the world will be at peace with no worries for damage or death. It truly will become a paradise for all mouse boi kind!