Mayo Mayo!

The main character of the spin-off of Mayo Chiki! is Hinata Mayoi. In the girl's washroom, Mayoi accidentally discovers that Konoe Subaru, a popular and handsome butler, is actually a girl. Since Mayoi knows Subaru's secret, she must team up with Subaru and her cruel mistress, Suzutsuki Kanade, to safeguard Subaru's secret from being uncovered.