Mitsuki is Izumi's younger sister, by one year, and is hired by Yoshitaka along with Izumi. By using photographs from Yoshitaka's media archive, she signs Izumi up for a 'Net Idol' website, which later, with revenue from Izumi's performances, helps Izumi pay off her debt. Mitsuki herself actually becomes very rich because of Izumi's popularity. Mitsuki always (when under Yoshitaka's contract) refers to Yoshitaka as Goshujin-sama or 'Master'. She even has her own fan club from her own school and other schools as well. She frequently comes up with (weird) competitions whenever two characters have divided opinions, most of the competitions ends up with Pochi playing some kind of key role that results in a bizarre conclusion, she seemes to favor Yoshitaka during these competitions and usually requires Izumi (albeit unwillingly) to compete. She loves the maid uniforms while as Izumi thinks they're way too revealing. Mitsuki even sang a song at a festival entitled "I'm a cute maid at a perverts house!"   (Source: Wikipedia)

Izumi Sawatari and her younger sister, Mitsuki Sawatari, have run away from home and are in need of employment. The only jobs available are as maids in the mansion of 14-year-old millionaire, Yoshitaka Nakabayashi. What seems like simple work is soon revealed to be far more than the girls bargained for when they find Yoshitaka to be an authoritative employer who demands they call him "Master". 
(Source: Sentai Filmworks)

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Ai Shimizu is a Japanese voice actress and professional wrestler. She has a career as a singer, signed to Lantis. She has released 14 singles (including joint and character singles) and four albums. She covered Yumi Matsutoya's "Toki o Kakeru Shōjo" as the B-side of her first single "Angel Fish" in 2003. She is known to have a close relationship with Mai Nakahara, having collaborated in eight anime where most of the characters they voiced in together had close connections: DearS, Kage Kara Mamoru!, My-HiME, My-Otome, My-Otome Zwei, Please Twins!, Sola, Strawberry Panic! and the Lucky Star drama CD. Shimizu has worked sporadic professional wrestling matches since December 2013

Yoshitaka Nakabayashi, a 14-year-old millionaire who got this huge inheritance after his parents died in an accident, found himself needed to be taken care of and tried to hire live-in maids to do the job. Two runaway girls, Izumi Sawatari and her younger sister Mitsuki, stumped into Nakabayashi's mansion and got hired by Yoshitaka immediately, for Yoshitaka is not only a rich boy but also a pervert with uniform fetishes, who wants to be addressed as goshujin-sama (master). Having nowhere else to settle down along with Mitsuki's pet alligator Pochi, Izumi accepted the job reluctantly.
 
(Source: Anime News Network)

This one is a spinoff from Kore ga Watashi no Goshujin sama. The story is about a school, Shiritsu Yurihime Gakuen, an all girl school specialized in preparing maid for the otaku moe industry. Of course, the leader is no less, a Nakabayashi, a heavy-class otaku with unlimited asset to burn for while seven generations. 
Our main heroine this time is Mochida Natsumi, a girl with hentai mind as worse as Yoshitaka and luck as bad as Izumi. She came with the ambition of building harem of imouto. But life is not as beautiful as in those harem love comedy genre anime/manga, because in this school, all the girls are well educated in otaku business. 
Her couple is Kitamura Kiriko, a.k.a Mitsuki 2. Cute, innocent (looks) and demonic personality to the bone and teeth. She's also Natsumi's roommate, imouto, as well as goshujin sama. 
(Source: Suiheisen)