Same story as Mayo Chiki! with the exception that the main character is now a high school girl who suffers from gynophobia. While using the girl's washroom she accidentally discovers that the popular and handsome butler Subaru Konoe is in fact a girl. Now that she knows about Subaru's secret, she must work together with Subaru and her sadistic mistress, Kanade Suzutsuki, to protect Subaru’s secret from being discovered. People who love Mayo Chiki! likes Mayo Mayo! also.