In the story, Takezou is the last remaining member of the koto club, a club dedicated to the traditional Japanese string instrument. If he doesn't find new members, the koto club will be terminated. One day, Takezou is alone in the club room when a student barges in and demands to join. The student is delinquent Chika Kudou, a guy who even scares delinquent upperclassmen at other schools. 

(Source: Anime News Network)

[Wiki (jp)](https://ja.wikipedia.org/wiki/%E9%AD%8F%E6%B6%BC%E5%AD%90)

Since the graduation of the senior members of the club, Takezou ends up being the sole member of the "Koto" (traditional Japanese string instrument) club. Now that the new school year has begun, Takezou will have to seek out new members into the club, or the club will become terminated. Out of nowhere, a new member barges into the near-abandoned club room, demanding to join the club. How will Takezou be able to keep his club alive and deal with this rascal of a new member?

The second season of Kono Oto Tomare!
 
Despite their best efforts during the Kanto Region Music Festival, the Koto Club is hit with the harsh reality of their poor performance. In the face of disappointment, they still decide to hone their skills and set sight on their next target.

Chiharu Houzuki