About the Apple Black Manga Volume 4 Holy Spectre

Many years ago, humans acquired 'Black' fruits from a tree that descended from the skies, turning humans into sorcerers. Although all of Black is now extinct, humans still have sorcery inherited from their ancestors. Blessed with the Arodihs arm by Merlin, the god of sorcery, Sano is raised and trained in isolation and secrecy to be the world's savior, known as the Trinity. The arm of the god of sorcery, Arodihs, has awakened within Sano to help rescue Black Bottom Island from the mayhem at the hands of Prince Ceazar. However, Arodihs's help comes at a cost Sano isn't prepared to pay. No one-including Sano himself-may ever see him the same way.