Even an invincible ninja may not be able to survive Hell's Paradise!

Gabimaru the Hollow is one of the most vicious ninja assassins ever to come out of the village of Iwagakure. He's ruthlessly efficient, but a betrayal results in him being handed a death sentence. There is only one hope: travel to a long-hidden island and recover an elixir that will make the shogun immortal and he will regain his freedom. Failure is not an option-on this island, Heaven and Hell are a hair's breadth away.

A group of sinister beings have lived on this island for several lifetimes, tinkering and experimenting on humans and the local fauna to further the goals of their dark sciences. Who are these otherworldly individuals that rule this beautiful and deadly island and how will Gabimaru manage to kill them to achieve his goal?