It's so rare that a second season is actually better than the first season, but as others have said this manages it. This anime is relaxing and contemplative while still retaining the fun of a high school sports anime.
All of the characters had meaningful development and there was so much depth I feel like I could watch 5 more seasons of this show. I really hope one day it gets picked up and discovered by a wider audience. I can't think of an anime that deserves it more.
The animation and character design as well as the music was all top notch as well. The series is a visual feast for the eyes. It's legitimately one of the best animes of its kind I've ever seen.