After defeating Wily and World Three for the first time, Lan and net-navi MegaMan.EXE are just getting back in the swing of things when news of a mysterious virus reaches their ears.
The "Zero Virus," as it's being called, has already infiltrated many navis, and is becoming more widespread every day. After the virus starts implanting itself in MegaMan's friends, the duo embarks on a journey in hopes of finding the source of this nasty virus and deleting it once and for all.
Network Transmission is a spin-off of the Battle Network series, so it will still revolve around controlling eleven year old Lan Hikari in the real world and his net-navigator MegaMan.EXE in the cyber world, which is where all of the fighting in the game takes place.
Like in the Battle Network series, MegaMan fights with battle chips, which are pieces of data sent to him by Lan that have a variety of effects, including the ability to inflict damage on, and in turn, delete enemy viruses and other navis. He also has his trusty MegaBuster, which is considerably weaker than battle chips, but much more convenient and loaded with a lifetime supply of ammunition.
The only real difference from the Battle Network series is the battle system, which is very similar to the classic, side-scrolling days of MegaMan's origination. Instead of fighting on three by three grids, you'll be moving Mega Man from left to right and defeating viruses as you make your way through the vast internet.
Battle chips play an important role in the game, so one of the game's main focuses is finding, earning, and obtaining by any means possible chips that flow with your fighting style and work well in coordination with other chips.