Hajime is a new club member, and is the protagonist of the story.   (Source: Wikipedia) 

In a school where after school activities are mandatory among all students, Hajime and her friend Sayo come across a new club that they have never seen before. The club is called "The Cultural Activity Preservation Club." The two enter the room to find all kinds of analog jobs and activities, such as handcrafting mats and toothpicks. This is a unique cultural manga mixed with comedy so as not to bore you, this is Double J! 
(Source: Mangahelpers)

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In a school where after school activities are mandatory among all students, Hajime and her friend Sayo come across a new club that they have never seen before. The club is called "The Cultural Activity Preservation Club." The two enter the room to find all kinds of analog jobs and activities, such as handcrafting mats and toothpicks. This is a unique cultural manga mixed with comedy so as not to bore you, this is Double J! 
 
(Source: MangaHelpers) 
 
Note: Volume 4 contains the side story "Musix Dentou" (ミュージックス伝統).

Hajime Usami