Hero Summoning Gone Wrong: The Kidnapped Demon Lord

"911, Heaven's branch, what's your emergency?"

"Hello. Erms, my friends and I may have accidentally summoned A Demon Lord, What do we do?"

"Wait, what?"

"Oh God, he's laughing maniacally while building his castle! Plz, help."

"Have you tried turning the summoning circle on and off..?"

"OH GOD, THERE'S TWO OF THEM NOW!"

"Bltisz, W-wut? Sorry, you're breaking up!"

"I KNOW YOU'RE JUST CRUMPLING PAPER!...DAMNIT DON"T JUST HANG UP!"

In which incompetent goddesses randomly transmigrate people from other worlds. Wai- is that a goddamn robot?!

WHY IS MY MAGIC POWER FANTASY STORY GOING WRONG?!