‘Kamen no Maid Guy’

Fujiwara Naeka is a typical 17 year-old high school student, or so we were lead to believe. It turns out she is one of two surviving heirs to a tycoon’s gigantic fortune, that she will inherit in half a year, when she turns 18. Fubuki, a young and beautiful maid, and Kogarashi, a big burly maid guy with a mask, have been assigned to keep Naeka and her brother Kousuke safe from those who would plot their demise, and to steal the fortune she would inherit.

Descriptions taken from AniDB.net