Gabimaru is a ninja on death row with one chance to see his wife again—by finding the elixir of immortality on a supernatural island and delivering it to the shogun. Standing in his way are his fellow convicts and the fearsome beasts that roam the island, devouring or killing anyone they encounter.

Gabimaru and his companions are confronted with the mysteries of tao, the supernatural phenomenon that turns the beings known as Lord Tensen into fearsome enemies. And when Gabimaru begins acting strangely, is there any hope for his companions, or will they face certain death at his hands?