Nogizaka Haruka no Himitsu, Kaichou wa Maid-sama! Recommendations
an ace of the school hiding a unique secret to keep her integrity intact
Both series features a main female protagonist who has a secret that she tries to hide from others but gets discovered by the main male protagonist. From there on, they both bond and later forms a sort of unique relationship.
Both series contains theme of comedy, drama, romance, and occasionally some serious moments thrown into the mix.
Both series are lighthearted and also takes place at similar settings with a similar feeling.