Seven wars have passed and throughout the years, classified intelligence collected over the battles have finally been published in an in-depth encyclopedia format for those who are interested in learning more. From the very First Rebellion War all the way to the future battles fought by Marco Rossi's descendants, they're all here.

Alto Mare. Home of the legendary Eon Pokemon. A beautiful city that could easily be described as the Shrine of Purity. History may be dictated by the winners, but our legacy is anything but victorious. Yet we remain vigilant, even in the face of extinction. A prequel to Pokemon Heroes: Uprising, and references the intro to the Japanese version of Pokemon Heroes.

Forty years have passed since the events of Metal Slug 7. Marco Rossi, now a decorated and grizzled General of the Regular Army, is now retired from the frontlines and a proud father. Prepare to embark on an historical adventure as he recalls his stories, right from the very first conflict up to the apocalyptic war with the Future Rebellion Army...