Manatsu no Spica

Manatsu and Hoshiko are childhood friends. However, the shy Hoshiko becomes a popular idol, and Manatsu cannot accept the changes in Hoshiko's new life and new surroundings, so she becomes unfriendly toward Hoshiko.... Things change and things stay the same. A story of "change" and "conflict" spun between two girls.
(Source: Comic Ogyaaa!!, translated)