Legendary ex-hitman Tarou Sakamoto has foiled countless assassins since a massive bounty was placed on his head. Yet he struggles to find peace and simply relax with his cherished family. A notorious enigma called Slur has imported a gang of deranged death row inmates to Japan, who stop at nothing to eliminate their targets. Sakamoto is not the sole objective—the criminals have been tasked with killing various other individuals, including the new employees at Sakamoto's convenience store, Shin Asakura and Lu Shaotang. The stakes rise even higher when the Order, a collective of Japan's most elite assassins, gets involved. As the inmates start causing chaos, Sakamoto and his allies must stay alert to protect everything they hold dear.