Monster Guild: The Dark Lord's (No-Good) Comeback! Vol. 6 (manga)

As the Luminaries’ Hero struggles to grasp the world’s mysteries, he faces a confrontation with the original hero. He must come to terms with facts that challenge the way he has viewed the world. Elsewhere, the monsters’ fortress is assaulted by new warriors seeking out the “new” Dark Lord. Thanks to the Dark Lord’s protection, however, these new competitors become much needed allies. As his reputation continues to grow, the Dark Lord begins to realize that it is his bonds and relationships that empower him to rise again.