The island of Fort Lemuria. Discovered in a vast ocean, this island's rich landscape was dotted with countless mysterious ruins and inhabited by strange animals known as Monsters. Humankind agreed to organize a Research Commission in order to investigate the island and the monsters that live there. Then one day, the island guardian Volzerk clashed with the legendary beast known as Magna, and both were apparently destroyed.

Ten years have passed since that day. Without the protection of Volzerk, the monsters of the island are in danger of extinction. However, a young girl is about to join the Research Commission. Her name is Fina, and she is the only human alive who witnessed Volzerk's disappearance. With her obsessive love of monsters, Fina's sole goal in life is to get as close to them as she can. And deep within her heart burns the desire to once again be reunited with Volzerk.