You watch this expecting a cute band show. Instead it corners you with the weight of a choice you made in junior high that you've been running from ever since. The brass band is just the stage; the real sound is two girls trying to figure out if they can face each other again, and what it costs to play the same instrument in the same room when things broke. By the finale, you'll understand why the music matters more than the competition.

Kumiko thought she'd left her brass band days behind. But when she, Hazuki, and Sapphire visit their high school's band club during spring of first year, she's pulled back into a world she'd tried to forget, especially when she runs into Reina, someone from her past who carries complicated history with her. While her friends jump at the chance to join, Kumiko hesitates, wrestling with old memories of a junior high competition that still stings. Once she's in, she finds herself playing the euphonium again in a band that isn't even ready for the local Sunfest. Their new advisor, Noboru Taki, lets the members decide whether to relax and enjoy themselves or train hard for a shot at nationals, and Kumiko isn't sure the harder path is worth it. Under his demanding practice, she and her bandmates have to work through their struggles together.