Short theater manners animations shown before Hibike! Euphonium Movie: Todoketai Melody.

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.

After a successful Ayanagi Festival, Yuuta Hoshitani and the members of Team Ootori celebrate the beginning of a new year and their final semester as first years at Ayanagi Academy. However, with Itsuki Ootori expelled from the Kao Council, Team Ootori no longer qualifies as a Star Team. Stripped of their privileges, they also will not be allowed to participate in the upcoming graduation ceremony. Desperate to get their mentor back, Hoshitani and the others hatch a plan to convince the Kao Council to allow Ootori to reassume his former position.

Born and raised in the countryside of Japan, Hinako Hina Sakuragi gets anxious easily when she talks to new people—so much so that she resembles a stiff scarecrow. To overcome this, Hina hopes to get involved in theater, inspired by a play she saw during her school's field trip. So, Hina moves into the Hitotose Manor in the bustling city of Tokyo to study at Fujiyama High School, aspiring to join the school's renowned theater club. But to Hina's dismay, she learns that Fujiyama High's theater club has been on a lengthy hiatus. Having already come to Tokyo and enrolled in the school, Hina is at a loss for what to do next. Sensing her disappointment and eagerness to learn theater, Chiaki Hagino, the landlady of Hitotose Manor, encourages Hina to create a troupe with the residents of Hitotose Manor as its members. Hinako Note follows Hina as she begins a new life in Tokyo attending Fujiyama High while learning the ropes of theater with the support of her friends along the way.