Lord_Streak
I really think he should learn all seeing eye. His martial art is the void algoritm, which is a martial art which uses information to select the most optimal action. I feel like all seeing eye would improve his strength massively more than any other physical martial art could. Because it gives rui more information which in turn lets him make an even more optimal decision. It directly impacts all actions rui does in a fight instead of giving him an extra option it upgrades the exact thing his entire martial are is bases on, using information to select the most optimal action. More information better descions. I find it kinda weird it hasn't been brought up yet about sensory skill general, they talked about him being better at sensing surroundings and being able to help the girl better if he knew what was going on, but not about how it would massively increase is information gathering power in a fight which massively improves his void algoritm. But maybe author has a reason for why it's not that important, well see.