It has been 6,000 years since mankind spread into space. On a remote giant gas planet, the people living in urban spaceships live by catching coma fish that swim through the atmosphere. Terra, a fisherman who has been constantly dumped in a society where married couples of both sexes are supposed to fish, meets a mysterious runaway girl named Diode and joins an unusually female pair on a powerful cornerstone ship. The two, who are opposites in size and personality, end up making a catch that no one expected...