thanks for the clarification, but why did the MC think that playing games with Kaede was illegal ?
Edit : forgot that teacher-student relationships are unorthodox, oops
Malpractice.
In several countries, malpractice can be consider a serious problem and a despiteful conduct by some medical professionals and other areas. However, Broken Dreams is a fictional story, so let's say in the universe where the events takes place, malpractice is considered a crime (and it should be considered that way in way more countries, but that's just my opinion). The protagonist at that point is not worried about what he did with Kaede, playing videogames? Not a problem at all, he's worried about scalating his future aproaches with her, making them more and more improper. The relationship between a psychologist and a patient must be professional.