Also, it should be obvious that there would be conditions, that there wouldn't be a magic so convenient to just snap your fingers and send people to another world.
i enjoy it greatly when magic has some actual science implemented in their logic. one of the reasons i like the "the irregular at magic high school" and "magic in this world is too far behind" so much.
let's see whether she will become a companion out of sheer boredom, since she could always just teleport back if she's needed, or not.
Also, it should be obvious that there would be conditions, that there wouldn't be a magic so convenient to just snap your fingers and send people to another world.
She's the strongest person so far according to the appraisal and they could easily negotiate as they don't want to fight and just want to go back to their world