A century ago, a cataclysmic flood submerged the world. Humans lost their homes, and gods vanished into obscurity. Poseidon used the last of his strength to create a sanctuary for humanity before falling into slumber. Legend has it, he will awaken and guide humans back home if one can pass through his realm. Thus, determined adventurers from the sanctuary venture forth in waves, aiming to conquer the realm and return to their homeland.