Better to face this battle after level 100, I had to battle 10 times until I formed my own winning strategy.
I farmed for way too long and reached level 174... having this much power wasnt the way to play... now its just a dating sim and I dont really have the choice to fail... I mean you can give up but thats different dialogue entirely... beating one of the characters with more than 100 levels gives unique dialogue though so thats pretty neat!