What would we do if monster girls come to our world
Get married to your dream mamono and be happy for the rest of your life.
I'd barricade my home, and then pray military arrives.
They would try to exterminate all the monsters and some would try to profit from the situation.
Elope,get married,and become an incubus
Gotta agree with @Abysswalker2126
What do you think?