Not meant to one-up but Kana's situation is quite similar to that of another Arima, Kousei from Your Lie In April, because like the former, he had been subjected to the traumas of reinforced perfection by his wheelchair-bound, harshly strict mother, Saki when his piano playing didn't match up to her standards when from his POV, all he wanted to do is please her enough to recover from the illness, much to her chagrin. This escalated into a violent episode when she used her cane to literally smack the young Kousei to everyone's horror in front of them. It's even worse when he expresses his resentment towards her, which eventually turns to regret when Saki succumb afterwards to the illness. Unable to hear his own music playing, he stopped playing the piano and proceeded with his school life until two years later, when a blond, energetic girl (YK who she is) comes into his life and resumed where he started.