Kamen no Maid Guy

Naeka Fujiwara, an ordinary high school student, learns she's set to inherit a massive fortune in the near future. But the promise of wealth attracts dangerous enemies who won’t hesitate to kill her for it. To keep her safe until she turns eighteen-the legal age to inherit-her wealthy grandfather hires a muscular, ex-commando maid named Kogarashi, also known as "Maid Guy," as her bodyguard.