Facing a death sentence, the emotionless ninja Gabimaru reflects on his violent past and futile execution attempts. Tasked with ending his life, the young executioner Sagiri chooses a different path, offering Gabimaru a chance at redemption. To secure his freedom, Gabimaru must retrieve the legendary Elixir of Life from the perilous Shinsekyo island—a feat no one has accomplished without dire consequences. Despite the unknown perils, Gabimaru, accompanied by ten fellow criminals, embarks on this treacherous journey in a bid to ensure a peaceful future for himself and his beloved wife.