The manga series by Kia Asamiya was licensed in North America and translated into English by Tokyopop beginning in 2002. It follows mostly the same story as the anime: A girl named Yui gets chosen as a corrector and must fight the computer viruses. But when the anime was created, they changed several things. But mostly it was just added situations to make more episodes.
Corrector Yui uses powers depending on what suit she's using. When she transforms, she gains great power.