Yui's best friend. She has a polite, calm, and caring personality.Her intelligence and innate ability with computers makes her a perfect candidate for Corrector, as expected by Dr. Inukai.From the beginning she was supposed to be a Corrector, but I.R. confused her with Yui, thanks to Grosser's intervention. 

~!When Dr. Inukai was passing Corrector tasks and abilities to her, she got manipulated by Grosser, who turned her into Dark Angel Haruna, but she was eventually saved by Yui. In the 2nd season, she again returns as a Corrector to assist Yui, first when Yui got petrified by infected insects, and later, when she helps Yui until the end of the 2nd season.!~ 

Curiously, she can use Element Suits more effectively than Yui.

In the year 2000-something, a massive central network called Comnet links the computers of the world, forming a single global computer system. Comnet, designed to serve the interests of mankind, is managed by the supercomputer, Grosser. But when Grosser decides to take over the world, a savior is needed! 
 
A computer-illiterate girl named Yui Kasuga happens upon software program IR, which recruits her as savior of Comnet and pulls her into the virtual world inside. There, Yui is given the power to become Corrector Yui so that she can fight against Grosser and his evil Corruptors. 
 
Inside the virtual world for the first time, Yui must face one of Grosser's henchmen. She must also battle another of Grosser's minions, this time one who's infecting the e-mail passed between Yui and her friends. And finally, Yui and IR suspect foul play when Chef Kirch, a family friend who can never get his recipes quite right, has to face customers who've turned into ravenous zombies! 
 
(Source: Viz Media)

[Twitter](https://twitter.com/i/user/980090402265997312)

Former voice actress.

She is a Mexican voice actress, best known for being "Official Jenny" in the Latin American Spanish dub of *Pokémon* and Mia Toretto in the *Fast and Furious* franchise. 

In a world where computers handle everyone's daily needs, the worst has happened: the computers have taken over Humanity's only hope is Yui Kasuga, a not-so-tech-savvy school girl who accidentally discovers a living computer program called I.R. and is transported into a computer-generated world. Together with I.R., she must fight Grosser, the evil master control program. (Source: Tokyopop)

The second season of Corrector Yui.

Haruna Kisaragi