Jigokuraku is a Japanese manga series written and illustrated by Yuji Kaku. The story follows Gabimaru, a ninja who is sentenced to death, and Yamada Asaemon Sagiri, an executioner. They embark on a quest to find the elixir of immortality on a mysterious island. The series explores themes of redemption, survival, and the quest for meaning in a brutal world. It has been praised for its dynamic action sequences and complex characters.