Trouble arises in Staccato one day. Demons show up and start to wreak havoc on the townspeople. The entire country seems to be suffering. The source of the problem is that the barrier which until now has kept the demons from crossing over to the human world, is weakening. The person who sustains it is losing her strength after holding it up for so many years. That person is Queen Horn of Sforzando. Hell King Bass is trying to break through the barrier and release their supreme leader, Kestra (Orchestra). One whose power is unparalleled yet is trapped somewhere in the world of the humans. (Source: AniDB)

Second season of ClassicaLoid.

Following the regular summer concert and retirement of the third-year members, Umimaku High School's Orchestra Club shifts its efforts to the upcoming national competition with a refreshed line-up focusing on the second-year members. Amidst the cacophony produced by the inconsistent motivation levels and understanding of their repertoire, the orchestra club members struggle to achieve their ideal sound...

Gloria Private Academy is a school where promising young people gather in all fields of entertainment, including music, art, and sports. In the music department, those who match the talent of great musicians are transplanted with a gift into their bodies and are called by the name of that musician. Beethoven, a young man who was discovered to be compatible after an injury, is one of them. After transferring to the school, Beethoven meets classmates with different gifts and discovers the charm of music, while aiming to win the competition. (Source: Official Site, translated)