Limbo the King

It's been eight years since the pandemic in which a deadly sleeping sickness claimed millions of lives. After a serious injury cost him a leg (and, nearly, his life), Petty Officer Adam Garfield retires from active service in the U.S. Navy. But his plan to focus on his family and physical therapy is shattered when he receives secret word that the sleeping sickness has returned, and it's his job to bring back the mysterious man who helped cure it by diving into people's memories—a man known by the codename "King."
(Source: Kodansha USA)