Searching for the key to the elixir of immortality, the group reaches the fortress of the island's monstrous ruler, the Tensen. To survive and escape, cooperation becomes essential, whether they're working with a convicted criminal or an executioner. Meanwhile, the shogunate orders new landings on the island of the Immortal Realm, led by Shugen Yamada Asayemon. Among them is the Ishigakure clan, who shares a past with Gabimaru. Eager to find the elixir and escape the island, Gabimaru and his companions face the Tensen in a battle that escalates into an epic clash between humans and immortals.