Unnamed Memory, Vol. 8 (manga)

Now that Lanak, King of Cuscull, has Tinasha, he plots against the Four Great Nations Alliance to rule the mainland. Oscar and the combined forces marched from Tayiri to stop him, only for Lanak to invite them to the ancient ruins. Just as Lanak is about to complete a ritual to seize control of the mainland, a previously quiet Tinasha stands before him!