Mysterious girl (Ouran High School Host Club)

This is the first time writting a fanfiction, and i try my best to make a good fanfiction, and my writting is not that good give you a warning, and i will take idea from you guys and try to add it in to the story.

A mysterious girl go to Ouran Academy with Haruhi, but what the host dint now that the same girl that watch over the host club,family and protecting them from danger, day and night.

I don't own "Ouran highschool host club anime, the credit do"