She's the prostitute that he ran into a few chapters back. She was also an adventurer, and was following him into the forest to rob him or to find what he was looking for. When Makoto and Mio notice them they try and stop them, but they escape and follow them to the ambrosia fields, and flat out state they plan on pillaging them. Makoto and Tomoe teleport them to Asora and they at first have Tomoe, then Mio watch over them, but with the Forest Ogres visiting they were stretched thin and Makoto presumed that the Hyumans of that world would be like Humans of our world -- i.e., he didn't expect them to be supremacists and thought the Orcs would be able to keep them entertained, not realizing the orcs keeping them entertained would be offensive to them.