Now that Kumiko Oumae has enrolled in Kitauji High School, she hopes to forget about her past. Despite her desire for a fresh start, she gets dragged into the school's band club by her new friends—Sapphire Kawashima and Hazuki Katou—and is once again stuck playing the euphonium. As the band currently stands, they won't be able to participate in the local festival, Sunfest, let alone compete at a national level. The band's new advisor, Noboru Taki, gives them a choice: they can relax and have fun, or practice hard and attempt to get into nationals. Not wanting to repeat her mistakes from middle school, Kumiko is doubtful as to whether they should try for nationals. Amidst the chaos, she learns that her old bandmate, Reina Kousaka (who she had a bitter relationship with) has joined Kitauji's band club. Under the pressure of Noboru's strict training, Kumiko and her bandmates must learn to overcome their struggles and find success together.

After the Kitauji High School concert band's auditions for club member participation in the Kyoto Prefectural Concert Band competition, 10 members fail to pass the strict evaluation. Despite being unable to play with the rest of the wind ensemble, the group—who decide to name themselves Team Monaka—is determined to support their peers in any way possible until the day of the competition. From carrying supplies to creating monaka-shaped good-luck charms, Team Monaka's efforts prove to be pivotal for the unforgettable, bittersweet summer in the concert band's journey toward nationals.

The long-awaited new work will be screened in theaters as a medium-length animation in the summer of 2023! Along with the summer brass band competition, the ensemble contest, commonly known as Ancon, is a place where exciting performances are held. The performance of several people in one group has a charm different from that of a competition. In order to participate in the Kyoto prefectural tournament of Ancon, a representative team is selected in the school's preliminary round. However, with over 50 members, the Kitauji High School brass band is facing a variety of problems! Will Kumiko, the newly appointed head of the club, be able to make it through the preliminary rounds? The days of struggle begin. (Source: Official Website, Translated)

Yuuta Hoshitani enrolls in the prestigious Ayanagi Academy in hopes of finding the high school student who inspired him. The academy is well-known for producing exceptional musical talent, but students must first compete for acceptance into the Musical Department. At the top of the department is the Kao Council—a group of third-year students who possess a great deal of influence over the school and admission into the department. The fastest route to entering the department for Hoshitani is to find a way into a Star Team, which would allow him to be taught by a member of the Kao Council. After catching the eyes of Itsuki Ootori, Hoshitani finds himself under the tutelage of the Kao Council's most eccentric member. Alongside him on Team Ootori is his roommate, Tooru Nayuki, fledgling Kabuki actor Kakeru Tengenji, the quiet Shuu Kuga, and Kaito Tsukigami, the younger brother of famous Ayanagi alumni Haruto. As Hoshitani struggles with his lack of talent, his teammates must also overcome their shortcomings. Facing opposition from other talented Star Teams, including the other four members of the Kao Council, Team Ootori must carve their own path as they aim to perform in the Ayanagi Festival.