Nanamori Chu☆Goraku Bu (七森中☆ごらく部) is a Japanese voice-actress unit formed in 2011 and best known for its music for the YuruYuri franchise. Closely tied to the series' lighthearted school-comedy tone, the group helped shape the playful, energetic sound that many fans associate with the anime. Its lineup consists of 三上枝織, 大久保瑠美, 大坪由佳, and 津田美波, and its releases have been issued through Pony Canyon.
As an anime song and cast-based unit, Nanamori Chu☆Goraku Bu performs character-driven tracks that sit comfortably within anison and pop. The songs are upbeat, catchy, and designed to match YuruYuri's carefree humor, which makes the group a familiar name for listeners who follow anime theme songs and voice-cast projects. The appeal also comes from the way performance and character identity overlap: the members are the voices behind the series, giving the music an extra connection for viewers who enjoy cast units. In January 2026, a 15th-anniversary event tied to Nanamori Chu☆Goraku Bu and YuruYuri was announced, underlining the unit's long-running role in the franchise.
