A story with the same setting as "Mayo Chiki!", except the main character is now a high school girl named Hinata Mayoi 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.