Spring in the first year of high school. Kumiko, a member of the brass band in junior high school, visits the high school brass band club with classmates Hazuki and Sapphire. There, she comes across Reina, her former classmate from junior high. Hazuki and Sapphire decide to join the club, but Kumiko can’t make up her mind. She recollects her experience with Reina at a competition in junior high school.

Tamako is just a normal young girl whose family has been making mochi for generations. As her birthday approaches, she happens to meet a talking bird who claims to be a royal court attendant looking for a bride for his master. After the encounter, Dera the bird decides to stay around her and becomes a part of Tamako's life and the neighborhood that she lives in.

In their last year of high school, two girls in the brass band club perform a song inspired by a fairy tale that parallels their friendship.

Autumn is in the air as the Kitauji High School concert band prepares for the National Competition. The band hears troubling news that Asuka Tanaka, vice president of the club and one of the key euphonium players in the band, may quit! Asuka is beautiful and charismatic and everyone relies on her, but she also has a cool side and never reveals her true self. Kumiko doesn’t get along with Asuka initially, but her feelings change when she learns that Asuka may actually drop out. Asuka has feelings about the euphonium that she cannot tell anyone else…

The next piece begins! Kumiko is now in her second year at Kitauji High School, and with a new year comes new problems. As if making it to Nationals wasn't hard enough, Kumiko is tasked with mentoring the concert band's troublesome first years – each with their own distinct personality and problems to solve. With Kumiko busy juggling both the concert band and her new role as senpai, how does her relationship with Shuuichi fit into the picture?

After swearing off music due to an incident at the middle school regional brass band competition, euphonist Kumiko Oumae enters high school, hoping for a fresh start. As fate would have it, she ends up surrounded by people with an interest in the brass band. Kumiko finds the motivation she needs to make music once more with the help of her bandmates, some old friends, some new. However, in the band itself, chaos reigns supreme. Despite their intention to qualify for the national band competition, as they currently are, just competing in the local festival will be a challenge—unless new band advisor Noboru Taki does something about it.

Hiwa Natsunagi is a high school student living in Iwaki City, Fukushima Prefecture. Worried about what to do with her life after graduation, she spots a poster for Spa Resort Hawaiians the “Hawaii of Tohoku” the place where her sister Mari used to work and applies to their new dancer (hula girl) campaign on a whim. Despite her lack of experience, Hiwa is accepted for the job, and starts on the path towards becoming a Hula Girl with her classmates, Kanna, Ranko, 'ohana and Shion. However, unable to keep in step with one another due to their differing personalities, their first stage ends in disaster. Called the “most pitiful rookies ever” the girls are disheartened, but they learn to share the good and bad...and strengthen their bond despite the occasional fumble. With their hearts and minds firmly set, the girls grace the stage once more.

Awaiting new club leader Kumiko is the Ensemble Contest, and the school's preliminary competition to determine the representative team to participate. Kumiko tries her best to make it to the preliminaries without incident, but the concert band club is so large that there seems to be no end to the problems. And as club leader, she finds herself busy consulting on all sorts of matters. While the other members are deciding on their teams, Kumiko herself hasn't even decided which she will join...