A Band Rabbit and a Boy 2013 on netflix

After class, first-year junior high school student Katsuhisa Okuda always wishes to go home quickly. One day, however, chasing a mysterious rabbit leads him to join the school’s brass band club. The brass band had the longest practice hours of any club, but Katsuhisa gradually becomes absorbed in music. Having devoted himself to practice for the regular concert, the long-awaited day finally arrives.