In the year of 20XX, a young boy by the name of Netto Hikari receives a very special gift as he enters the 5th grade. His very own customized net navi, Rockman! Despite Rockman's small size and far more responsible personality, the two boys quickly become the best of friends. A net navi is designed to guide his operator from the inside of his or her PErsonal Terminal, or simply PET for short. Children and adults alike enjoy friendly "Net Battles", where they spar their navis against each other to prove their worth. 
(Source: Official Site)

Netto's father Yuuichirou Hikari has made a scientific breakthrough by introducing the "synchro chips". If an operator and his or her navi are in a special enviroment known as a "dimensional area", they can fuse together in the real world via a technique called "cross fusion"! Yuuichirou's first test subject, Misaki Gorou, attempts the process and sadly fails. Netto offers to try with Rockman, but his father forbids it. Cross Fusion puts enormous strain on the operator's health, and battling in the real world could mean death. 
(Source: Official Site)

Another manga loosely based on the MegaMan Battle Network game series. 

The year is 200X and everyone is now connected to the Cyber Network. People carry their own PET (Personal Terminal) and are paired up with an artificial intelligence program called a NetNavi (or NetNavigator). Computers have turned the world into a bright and shiny utopia but there's always trouble in paradise. While the invention of the PET and NetNavis has brought great benefits to the world, computer hacking, virus spreading and other high-tech crimes are becoming a major problem. A sinister organization by the name of World Three has appeared and they've vowed to destroy this technological wonderland. Enter our young hero, Lan Hikari, an intensely curious and cheerful fifth grader. Synchronized with his NetNavigator, MegaMan, he becomes a super-charged dynamo. In and out of the Net, Lan and MegaMan do their best to thwart World Three's never-ending quest to take over the world! 
(Source: VIZ Media)

The year is 21XX. Reploids are commonplace now, after Dr. Cain rediscovered Dr. Light's old lab and based several designs off of Dr.Light's original, called "Megaman X." X, meanwhile, has joined the Maverick Hunters, and works with unit leader Zero under the command of General Sigma. It is their job to terminate rogue reploids, those who have become violent.
 
(Source: Anime News Network)

The anime (episode 2, to be exact), where Rockman travels from the Game-World to the real world to learn some cultural differences about Japan, was intended to be a special episode for the original Mega Man cartoon series by Ruby-Spears, which aired around 1995 in the United States. As it seems, the special was finished before Ruby-Spears decided to redo their whole show with a completely new design better suited for American audiences. 
Not fitting the new style anymore, it never was included in the series. Still, two more episodes about the same story were produced a bit later, this time under the main title "Rockman" (unlike episode 2, where he's called "Mega Man" even in the Japanese dub). 
It's unknown if these 3 episodes ever saw an official release, until 2002, when Capcom of Japan decided to finally release them on DVD for Rockman's 15th Anniversary, all featuring a Japanese and English dub, but no subtitles. It's unknown if there are any more secret animated works of the original Rockman game series.

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