Mega Man Battle Network 4 - Story

Story

The game starts out with a cutscene. Scientists suddenly discover a massive asteroid hurtling towards the Earth. It has just passed Pluto. The scientists scramble to alert their superiors against this new threat.

Meanwhile, MegaMan and Lan Hikari have found themselves engaged in battle with a super-powerful Navi named ShadeMan. ShadeMan’s armor is too powerful for MegaMan to penetrate, but ShadeMan has lost his weapon systems, and is then also confronted by Protoman, so he retreats. MegaMan notices that ShadeMan dropped an unknown chip. He and Lan are told by Higsby that it is a DarkChip, a chip that makes a Navi super-powerful, but also turns that Navi evil. They hold on to it, vowing never to use it.

Later that day, Lan comes home to find his mother on the floor, in a gas-induced sleep. A note on his computer instructs him to surrender the DarkChip, or they will do more to his family.

Lan and MegaMan go to an amusement park, where they meet ShadeMan again. He demands the DarkChip, which MegaMan destroys in front of him. ShadeMan engages MegaMan in battle. ShadeMan is still invulnerable to MegaMan’s weapons, until a powerful chip inexplicably appears in MegaMan’s inventory. When he uses it, ShadeMan is defeated easily. MegaMan soon realizes that he used a DarkChip.

Lan and Megaman then enter a series of net battle tournaments. It's revealed to them that the tournaments were held to determine the world's strongest net navi. Because the asteroid is discovered to have a computer controlling it, a net navi could travel to it and stop it. Megaman is sent to the asteroid, and upon entering the asteroid's control room, he meets LaserMan and Duo, the Operating System of the asteroid. Duo explains that he must destroy the Earth, because it is full of evil. After his "speech", Duo extracts Megaman's DarkSoul which is defeated by Megaman. After the defeat of MegaMan’s DarkSoul and a fight with Duo himself, Duo allows MegaMan to try to divert the asteroid. Try as he might, the asteroid is too heavy for him to divert alone.

MegaMan is able to channel the goodwill of the people on Earth, which gives him the strength to move the asteroid away from the Earth. Duo agrees to leave the Earth alone for several hundred more years.