Kamen no Maid Guy

Naeka is a seventeen year old girl who will inherit a large fortune when she turns eighteen, however, many people might try to assassinate her and take the fortune, so her rich grandfather sends two maids, Kogarashi and Fubuki to act as her and her brother's bodyguards.

When Naeka discovers that the reason she's failing math is because her enormous breasts are taking away nutrients from her brain, she, her brother, Fubuki and Kogarashi try to find different ways of making her chest flatter.

When Naeka receives a love letter, she doesn't care. Soon enough, her friends and family find out that she's not interested in love due to her first crush hating her because she nearly poisoned him. So her friends and family decide to help her overcome this incident by teaching her how to cook. Meanwhile Kogarashi is setting up a romantic setting for her and the other person, which he laces full of aphrodisiac gas to make sure all goes well. When Naeka goes to the place where she is supposed to meet the person, she finds out it is a girl! Kogarashi, still thinking his plan is good, locks both of them in there. Giving them some alone time. The lone girl gets on top of Naeka and plays with her breasts, though Naeka attempts to resist she eventually can't resist the aphrodisiac gas and has sex with the girl.

When a group of underwear thieves steal Naeka's panties, it's up to Kogarashi to recover them. Meanwhile, a new girl, Elizabeth K. Strawberryfield, joins Naeka's class and tries to beat Naeka at everything she does.

Naeka and Elizabeth keep competing in everything. Kogarashi and Fubuki detect several bugs and spy cameras placed around the house and have to find out who placed them and try to stop them from placing more.

After Kogarashi, lacking much moral skill, bothers Fubuki about her small but constant weight gain, Fubuki snaps and goes into an extreme diet, dragging Naeka into it along the way. But soon enough, Fubuki's diet methods get out of hand.