hey guys..help me plss..long ago i read Shoujo..i dont remember the tittle..so it was like...

hey guys..help me plss..long ago i read Shoujo..i dont remember the tittle..so it was like this..the girl brother is a idol his name is ayamu ( i think)..the girl date with his brother friend name sai ( i think) he is also a idol..ummm they are a high school students and the school have 2 deference section..the idol one and normal one...i think, the first time the girl meet sai, sai kiss her..the girl is 1 year older that sai..pls help me

oh n sorry for my bad english cuz it not my language..