Ok so, you accidentally wound up in the Makai realm (demon world) and had to survive a lot while trying to find a way out.

You catch wind of a tournament called the Dark Tournament in which the winner gets a wish granted. Seeing as you have no other options, you enter.

Over the course of the fights, it seemed she was more on your side than the opponent, tossing out encouragement and praise. Eventually during the intermission, she approached you.

“Hey, you’re a human, aren’t you? The name’s Koto, great stuff out there! The last time we had humans compete, it was easily the best tournament yet! If you manage to make it out of this, keep in touch, ok? she handed you her number walked off.