>>45414282From my own personal experience, I feel like such a story would have to explore Klara as a character. What made her like this? Was she always like this, or did she change at one point? Was it instilled in her by someone else? Having a cute, fun story about Klara opening up would be a lot more than just hooking up with (you), it would likely be shedding years of emotional baggage all at once. It would explore her background, and history, and maybe even family. The story would be ABOUT her, and the other person involved I feel like would have to be connected on a much larger level than just another person training at the dojo.
A fun way to start would be to frame the MC as someone that knew her before she became what she is now, who knew a completely different Klara before this, and end up meeting in the dojo in a complete coincidence. Maybe she would recognize him, and he wouldn't. Have them build up to the climax that she simply comes clean with him, about everything, as he's probably just trying to be a nice person despite her most likely derision at his good attitude, because let's face it, it's going to take a stubborn head to get through that thick outer coating.
>the end point(You) help her actually put in the time and effort and graduate, with her newfound look at life. That's where the idea takes me, anyway. Little moments might work best, actually, with each chapter showing a different period of time, and they don't always have to directly connect with each other. Bits and pieces that lead to the one conclusion, if that makes sense.
I put too much time into writing these kinds of things, so when an idea like this springs to mind I can't help but just let the ideas flow from it 
