The Badan Empire killed Ryo Murasame's older sister, and he had been cybernetically remodeled into ZX. However, he regained himself after an accident and stood up fearlessly.

A lavish retelling of the true story of the final voyage and ultimate destruction and sinking of the battleship Yamato, Japan's greatest flagship during the Second World War.

Rica wanting a fresh start leaves her friends and past life behind or at least that is what she thinks as trouble always seems to find her. Rica's looks into a ship that exploded and everyone who survived this disaster who comes in contact with her dies. Rica only chance of solving the mystery of the sunken ship is if she can locate a old friend of hers who just happened to be on that ship the night it blew up.