Hmm... she seemed battle ready somehow, aware of her senses. The request for a briefing, rather than an explanation indicated she was a hero in training, or maybe a fully fledged one.

"Very well!"

Putting some boom into his usually reedy voice, All Might proclaimed, "We are here, on Medietas, a collection of islands that were in the sky until previously! Each one of them have a theme, possibly from the collection of locations they were taken from as attributed to the large crater in the shape of one of the islands."