Takeya's stepmother, and one of the few people who can keep the rambunctious Natsuki in line; she taught Natsuki all of the techniques that she uses to beat her big brother up with, or so it appears. It is also implied that Takeya and Harumi could have fallen in love but before Takeya can say these words Harumi sticks a cherry tomato in his mouth and says "it doesn't matter now I am your mother".(Another indication was when Takeya turned to Neneko in panic as Ren was prepared to leave the Earth, she stated that Harumi dumped him) Harumi is a truly funny character with her own "personal attacks", such as the "Harumi-driver". 

Ikuhara Takeya is a high school student living a normal life. He is not interested in the commotion around a UFO filled with beautiful alien females that crashed on earth a year ago. The aliens, known as DearS, are deciding to take permanent residence on earth. What no one knows is that these aliens are a slave species whose sole purpose is to serve and please their masters. One day, Takeya spots a person shivering behind some bushes. This person, Ren, is one of the DearS, and after being saved by Takeya she chooses him as her master. Takeya, who doesn't know about the master-slave relationship of DearS, tries to teach Ren the normal lifestyle of the people on earth, though he constantly fears that Ren is an evil alien who's trying to brainwash him. Ren, however, isn't like other DearS. She is in fact malfunctioning and is being tracked down by their leader. Meanwhile, Takeya begins to learn more about DearS, and a mythical DearS relationship called &ldquo;Gift&rdquo; begins to develop between them.
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(Source: Anime News Network)

Miu wins the grand prize in the local shopping district raffle, which is a free pass for up to four people to Yuniataru Studio, a spa resort. She decides to take Takeya, Ren and Neneko since her grandparents couldn't attend. 

Aliens have landed on Earth and are now a normal part of society. These beautiful beings have been given the name "DearS" and are trusted and welcomed by most humans. In order for the "DearS" to learn Earth's customs, they are sent to random high schools to "home-stay." When Takeya helps a DearS in his school, she calls him "Master." Thus begins the humorous life of Takeya and his sexy alien follower, Ren, who tries to figure out the wacky customs of this place called Earth! 
<br><br>(Source: Tokyopop)

Harumi Ikuhara