Naisho No Otome Revolver summary:

Short synopsis: Think "Kampfer" meets "Infinite Stratos" Long synposis: The story is about a High School student named Lihau Yuexiang/Tachibana who's goal is to be recognized as a manly man. The problem is that he looks exactly like a girl and is constantly bullied by his peers because of this. He is gifted the power to become a gunner princess fighter and hopes to use this newfound strength to prevent the bullying and finally become manly.