She is a genius cyberdoll said to have an IQ of 50,000 in human terms. Kei is originally given the mission of formulating a strategy to get May back. She becomes interested in Kazuya after hearing how he regards cyberdolls and changes her mind. Kei's memory bank of facts is extensive, but she often takes a while to process information that is more abstract. At times, abstract or philosophical questions can cause her CPU to lock up. 

~!She later forms a crush on Kazuya and takes up residence in his closet.!~

(Source: Wikipedia) 

Saotome Kazuya is a computer whiz. One day his friend Nanbara, threatens him with a computer virus. Trying to stop the virus, Kazuya ends up making a special order. May is a cyberdoll that arrives at his door a few minutes later and she is 1/6th the size of a normal person, which makes for many awkward situations. Not to mention the fact Kazuya can't even afford to keep May. Cyberdyne is not satisfied with Kazuya's non-payments and will do anything to retrieve CBD May.
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(Source: Anime News Network)

Wife of voice actor [Yuji Ueda](https://anilist.co/staff/95058/Yuuji-Ueda)

__Non-anime roles:__
~!Alex in "Totally Spies!" (animated TV series) (Japanese)  
Bimba in "Breath of Fire III: Drama Album" (Drama) (Japanese)  
Kakurine in "Eretzvaju (Evil Zone)" (VG) (Japanese)  
Mag Launcher in "Evolution 2: Far Off Promise" (VG) (Japanese)  
Majic Lin in "Majutsushi Orphen" (VG)  
Meredy in "Tales of Eternia" (VG) (Japanese)  
Meril in "Odin Sphere" (VG) (Japanese)  
Momoko Ando in "True Love Story 2" (VG) (Japanese)  
Pai-Siang in "Galaxy Fraulein Yuna 3: Final Edition" (VG) (Japanese)  
Pai-Siang in "Galaxy Fraulein Yuna 3: Lightning Angel" (VG) (Japanese)  
Ruri Hoshino in "Super Robot Wars Impact" (VG/PS2) (Japanese)  
Ruri Hoshino in "Super Robot Wars MX" (VG/PS2) (Japanese)  
Satsuki Yumiduka in "Melty Blood: ReAct" (VG) (Japanese)  
Tamami Konno in "Tokimeki Memorial Girl's Side" (VG) (Japanese)  
Xiaomu in "Mugen no Frontier - Super Robot Taisen OG Saga" (VG) (Japanese)  
Xiaomu in "Namco X Capcom" (VG) (Japanese)!~

At Kazuya's apartment, a package from Cyberdoll Mami filled with five "Chibi-Cyberdoll Mays" arrives. Later, an accident causes May's personality to go into the five mini-May's, each one receiving a distinct aspect of her personality. Elsewhere, Rena finds a lost child and brings it home.