He is the self-proclaimed "best friend and worst enemy" of [Kazuya Saotome](https://anilist.co/character/7115/Saotome-Kazuya).

Nanbara is very rich with an eccentric, egomaniacal personality. He is jealous of constantly being outdone in projects by the poor Kazuya and will do anything to see him suffer. It was his virus that caused Kazuya to inadvertently to order [May](https://anilist.co/character/7109/May). Nanbara gets [Sara](https://anilist.co/character/7113/Sara) do his chores by offering ramen in exchange. Though very antagonistic against May in her smaller form, he falls head over heels in love when she is enlarged to human size.

It was later revealed that he and Kazuya will form the Cyberdyne Corporation that produces the Cyberdolls and will be run by their descendants.

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)

__Spouse:__ [Omi Minami](https://anilist.co/staff/95323)
__Education:__ Tamagawa University
__Hobbies:__ music, photography, violin
__Skills & Abilities:__ Japanese swordfighting (Tate)

[Wiki (jp)](https://ja.wikipedia.org/wiki/うえだゆうじ)

Italian voice actor of several anime & movies characters.

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.

Koutarou Nanbara