Megaman-x storie

A strange anomaly has been detected within the Eurasia crash site. As X heads there, he wasn't ready for what he saw. Takes place before X6

It is 2XX4, the year as we know it further descends unto the brink of destruction and anarchy. With a new and evolved threat emerging from the ashes of the previous Maverick Rebellion, one that may prove to be a more interesting challenge to overcome...

X defeated Sigma for what appears to be the last time, finds a powerful ally in a reploid named Mercury, and worries about a reploid war.