When a soldier finds himself in the middle of a global war in a world not his own, and the enemy consists of rock women, what does a dog of war do? Whatever he does, the universe will never be the same. From Parasites to Gems, this Diamond Dog will have his hands full while dealing with terrifyingly familiar events...

After the events of the story mode campaign, DJ Octavio sends his only son to spy on the agents. Little did Jr know what would await him when he arrives in Inkopolis and upon meeting agents 3, 4, 5, Charlotte, Teuta, and Erink respectively.