To be honest, if this happened to Anonymous they wouldn't freak out.
"OH MY GOD! A MECHA IS ATTACKING EARTH?! HOW WILL WE SURVIVE?!"
our response would be
"Don't worry, either an alien will save us, a chosen one will get a robot of greater strength, or there's a secret organization on the way."
Even if we were thrown into a Japanese folklore world, the first thing we'd do would be to find the nearest attractive girl wearing a kimono and pull the ribbon so that she spins around and around until it comes off.