When I returned from another world, humanity had transformed into magical girls, didn't it?

I saved the other world. Together with my companions, I overcame hardship and finally saved the other world. And then I... returned to Earth. Earth after a year and a half. An emotional reunion! A joyful family! We talked about everything that had happened until the sun set... Normally, that's how it should have gone. However, what awaited me at home was... for some reason, my father had become a little girl. Humanity... while I was gone... had been transformed into little girls. No, magical girls.