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Mermen (マーマン) are an aquatic demi-human race that inhabits the oceans of the New World.
Mermen were a race that inhabited the seas located around the Roble Holy Kingdom. They had a long history of mutual cooperation with that nation. However, the memories of war with demi-humans still remain strong with the humans and elevate the sentiment that they could never truly accept them as allies.
According to the Web Novel, Mermen were marine creatures.