Anyone know?

(Bare with me(Ｔ▽Ｔ)) There's this hetero romance manga where the female protagonist is singing hallelujah or something of the like on a bridge and gets scouted by a famous music producer...she also looks plain in the beginning and has a sickly brother.. Alsooo he takes her v card to make her a better singer (which surprisingly it did)...I also think she was trained in a gospel church by a famous opera singer and didn't even know it...yup that's all I got