地獄楽 8 [Jigokuraku 8] by Yūji Kaku

In this volume the quest for the island’s elixir intensifies as the protagonists confront increasingly brutal opponents and shifting alliances; key backstories and hidden motives are revealed, forcing characters to face harsh moral choices while brutal battles and eerie island mysteries push the group toward a tense turning point in their search for salvation and revenge.

Purchase from Bookshop.org