Final Fantasy: Unlimited - S01

Years ago, an interdimensional portal opened and released two beasts into the skies over the Sea of Japan, where they could be seen by every country along the coast. After destroying the naval patrol sent to investigate, the two beasts turned on each other. Watching the fight from Japan, scientists Joe and Marie Hayakawa were pulled into the rift. When they returned to Earth, they gathered the academic findings from their journey and published them in a legendary book called "Day of Succession". Twelve years later, the couple attempted a second expedition to that other dimension, and they never came back. Twins Ai and Yu Hayakawa decide to set out in search of their parents and the mysterious Wonderland they studied. In the ruins of an abandoned subway station, the two wait for a train to take them to the world beyond. On board they meet Lisa Pacifist, who quickly decides to help the two in the search for their missing family. Can the three of them manage to find Joe and Marie?