Hell's Paradise_ Jigokuraku (en)
Hell's Paradise: Jigokuraku follows Gabimaru the Hollow, a former ninja executioner on death row who is offered a full pardon if he can retrieve the Elixir of Life from a mysterious island. He is paired with Sagiri, a skilled executioner, and together they join a group of convicts and guards on a dangerous expedition. The island is a surreal, beautiful nightmare filled with deadly flora, monstrous creatures, and other, more twisted humans seeking the same goal. Readers enjoy it for its fast-paced, brutal action, unique supernatural horror elements, the moral ambiguity of its characters, and the deep, often tragic backstories revealed as the characters struggle for survival and redemption.