Imagine two robot twins, one of them an angel while other one is a fallen angel being turned into chibi versions of them... Which actually happened!

Both of them were just fighting (I mean they are opposite so yeah they r enemies) above before randomly shifting to tiny size and falling to Earth. Both of them are in a place they aren't familiar, looking around in confusion. Despite the two being immortal beings, they are currently weak and their size could be advantage for others.

((Start however you want and can mention the place where they are currently at!))