The Third Great Shinobi War has just ended. Countries are recovering from the tragedies and losses caused by the battles, and new alliances between countries, villages and clans are be being established. However, the situation is very fragile and many fear the start of a new conflict. Even when Daimyo are gathered to negotiate of peace and plans of the future, the Hidden Villages haven't quite lowered their weapons yet.
During the war, a large amount of Missing-Nin escaped or framed their death. They are gathering to create a formidable, criminal fighting force capable of breaking the temporary peace and driving the whole world into chaos...