Irregular Hunter X: The Day of Sigma
Mega Man Maverick Hunter X: The Day of Sigma
The Day of Σ
Megaman X - The Day of Sigma
イレギュラーハンターX The Day of Σ
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: ANN)