The series is set in a parallel universe from the original Mega Man series, where the internet has become integrated with almost every piece of electronic equipment in existence (from TVs to ovens). In fact, it's become so complicated that special programs called Internet Navigators, NetNavis for short, are needed to efficiently process all of the data. NetNavis are stored in hand-held devices called Personal Terminals (PET). These devices act as phones, pagers, instant messengers, news beams, and hacking devices all rolled into one, essentially making them portable computers.
The main characters of the series are a fifth-grader named Lan Hikari (光熱斗 Netto Hikari in Japan) and his NetNavi MegaMan.EXE (Rockman.EXE), this universe's incarnation of Mega Man. Although MegaMan.EXE has no body (unless the PET device itself counts), he can wander around in cyberspace and explore computer systems as if they were alternate worlds. Together, Lan and MegaMan cooperate to fight off cyber criminals and viruses.
There are four games in the series with a manga and anime called "MegaMan NT Warrior"
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Mega Man Battle Network
FanfictionWhat you need to know about this incarnation of the Blue Bomber