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...

The national idol unit "Fool's End" suddenly announced its dissolution. The group will hand over the "Tenka Bata," which can only be held by the best idols in the world, to a successor group. The successor group will be decided based on the total score of each group's music sales, live attendance, and merchandise sales. The race was named the "Battle Royale for the Tenka Bata," and it marks the beginning of a nationwide battle of the idols. At the Kawanakajima Festival, where the three groups NO PRINCESS, Lunatic Eyes, and "X-UC" were to perform, an incident occurred to a member of X-UC. Umino Risa, the youngest member of X-UC, is so anxious about the high level of performance of the other idols that she runs away. As a result, X-UC will have to go on stage with the nine remaining members. Then the announcement is made that this Kawanakajima festival will be the first battle of the "Battle Royale for the Tenka Bata"!

Kitauji High School Brass Band 5th Anniversary Concert

Poppin'Party, Roselia, and RAISE A SUILEN's successful concert at the Budokan has passed. Kasumi and the others, who have left a lingering sound on the stage of their dreams, are approached by a mysterious woman. Their next stage is overseas?! Poppin'Party's music isn't stopping yet!

It all began quite suddenly. Akihito, who appears human but is actually half yomu with the power to quickly heal himself, sees a freshman girl who appears ready to jump from the school rooftop. The girl, Mirai, who has the ability to manipulate blood, which is unique even among members of the spirit world, continues to fight her isolation. Akihito decides at that moment to save Mirai, but disturbing events soon begin to unfold.

The battle is over, and they can go about their normal lives now... or so they thought. With no time to rejoice after miraculously saving Mirai from Beyond the Boundary, Mirai lost all her memories. Akihito, now a high school senior, starts to avoid Mirai thinking it’s for the better. Not aware of Akihito’s feelings, Mirai tries to get closer to Akihito. Then, someone who knows of Mirai appears in front of the two. With Akihito’s troubles in vain, Mirai once again sets forth on a battle that forces her to look within.

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.

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.

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…