The main characters of the series are a fifth-grader named Lan Hikari (光熱斗 Netto Hikari in Japan?) and his NetNavi best friend MegaMan.EXE (Rockman.EXE), this universe's incarnation of the legendary Blue Bomber. 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.EXE (also known as just MegaMan) cooperate to fight off hackers and viruses.