A techie transmigrates into the body of a petite, baby-faced Demon King with a huge bust, facing an absurdly difficult situation from the start, with trouble both inside and out. See how he uses modern knowledge to save the demon race from disaster!
Wait, buddy, I think I can explain what I've been doing...
I only wore a maid outfit and desperately fawned over the hero to save my life. There's absolutely no way I'm interested in cross-dressing!
I only wear cute skirts and dress up every day at the Academy of Magic so I don't arouse suspicion. I definitely won't become a girl!
And marrying the hero was only to foster friendly relations between our countries. It's not because I like him!
The little Demon King really just wants to restore the demon race to greatness!