Choppiri Yabame na Himitsu no Aru Onnanoko ga Koibito tte Dou desu ka?

Why am I the only one who knows the beautiful girl's secret!? I, Amamiya Tsukito one day found out a huge secret!! The suspects are the student councils beauties. The student council president - the beautiful stepsister, the wholesome idol of the school, the ojou-sama public morals president and the cute junior. I somehow managed to join the student council to get closer to them but i got to know of their dangerous secret! 「You are the only who knows about this, you know, Tsukito-kun~」 So I, who got to see their secret am the only one who knows the real them without their mask. Is this the beginning of a secret relationship with slightly dangerous girls?! (Source: HJ-Bunko)