She's a martial arts instuctor called Yuki that runs a Dojo on the college campus, and she agrees to teach you several moves (and weaknesses of the elite students) until you can potentially fight Leah and the other 11 elite girls. There is a scene when you first fight her where she kicks your butt till you pass out (well, more like has you in a hold where she almost dislocates your arm), but nothing erotic with her at the moment. I suspect it might be a long way to go if the dev decides to implement a romance path/submitting to Yuki as well, as the focus will likely stay on Leah for the time being and the subsequent elite girls that you're supposed to serve. (two of which you already meet and have prettier hairstyles than Leah in my opinion)
You should try out the game when you have the time as I'd say it has about as much potential as Domina had early on if not more, and at least so far this dev definitely hasn't accrued deka's level of infamy with tiny bug-ridden updates and long delays, so it probably has a much better chance of actually being completed by the turn of the century!

(this dev really seems to put a lot of work into his game based on the first update, so the joke is only really aimed at deka...)