Mangas

From CoyoMoose: After her mom re-married, Ema moved into the Asahina Family House and acquired 11 brothers. Ema intended to live peacefully with them as a family, but the sudden appearance of a girl in an all male household causes discord. Going on with their lives, the brother's feelings for Ema change and the start of a same roof forbidden romance begins.

The protagonist Fujisaki Futaba is a university student who had no interest whatsoever in idols… until she got a job at James Entertainment and is assigned to manage the popular idol group, “forttê”.(Source: VNDB)