No wonder a lot of people were complaining about the ending, I myself doesn't like this type of end with a "friendship, effort and victory" type of shit. In sports anime, this trope is overused, so I was expecting a different end where Ayano stays in the dark side and become more twisted, such as love destroying player who enjoy badminton.
I was rooting for Ayano right from the beginning, with her sad past and her dark characteristic is pretty enjoyable to watch, she's very quirky and special, while Nagisa on the other hand is pretty bland. She's boring, feels like a generic character with the motto "friendship, effort and victory" shounen genre type. She lacks any specialty, so the plot ended up nerfing other character to her level for the fairness.
I'm already at the age where to understand that effort doesn't always equal to success anymore, so seeing this generic youth trope ending is pretty hard for my soul.
It was a good 8/10, but then episode 12 and 13 comes in, and it drops to 5/10, bland and generic.