The parts division is "unpopular | actress-to-be | idol". So she's an idol who is unpopular and actress-to-be.Thanks, man.
Now I'm waiting for Sera's Yandere Stalkerish tendencies to be revealed.
Also, on Page 30, It's says "Unpopular actress to-be-Idol" for Sayuki, shouldn't it be other way around? She is a unpopular idol who wants to be an actress.