"I don't accept that improvement has stopped coming towards me. Even if it will stop coming towards me, it's because improvement never even came to me anymore, while I always practiced at my best. That's not a stagnation that is supposed to happen, only fools would think that way."
isn't that Phos from Houseki no Kuni? (the golden hand looks like it's her but there was nothing about the eye in the anime, so it's likely to be a manga thing)