As Illusia continues his quest, he finds himself on a strange new island at the end of the world. But this isn't just any island—it's full of A-rank and even L-rank monsters no one has ever seen before! What's more, the ruins are covered in English and hiragana, characters from the old world. His curiosity piqued, Illusia ventures deeper into the ruins, determined to uncover its secrets...and stumbles upon the legendary dragon king Diabolos. But does Illusia's "Dragon King's Son" skill mean that Diabolos is his dad?!