Corrector Yui (コレクターユイ, Korekutā Yui?) is a magical girl anime and manga, it was created by Kia Asamiya and written and drawn by Keiko Okamoto. The manga was published in Japan in 1999 and released in English by TOKYOPOP in 2002. However, there are rumors that in 2009 Tokyopop may drop the rights to the English-language version of the manga. If that occurs, Viz Media may pick up the property. The anime was produced by Nippon Animation (co-producers of Dogtanian and the Three Muskehounds fame) and broadcast on NHK in 1999, it has been released in the United States by Viz Media after it was licensed by Shopro Entertainment. This series has been exhibited on Cartoon Network.

This series follows a basic magical-girl progression, and falls into many of the magical girl tropes common in the late nineties. The series is innovative amongst magical girl series in that Yui's powers all derive from not just the technology she uses, but are incorporated entirely into her on-line avatar, with no real powers granted outside of the network.

Source: Wikipedia