Kami nomi zo Shiru Sekai: 4-nin to Idol

Eli, Chihiro, and Miyako try to form a band but end up looking to Katsuragi for help. In the process they meet Kanon and become friends/ rivals.

(Source: ANN)An OVA bundled with the 14th volume of the manga, animating chapters 54 and 55 from the 6th volume of the manga.