Deep-sea submersible pilot Onodera and geophysicist Professor Tadokoro trace a string of earthquakes and a sunken Ogasawara islet to a single, unthinkable conclusion: the Japanese archipelago itself is sinking. This second manga adaptation of the 1973 novel runs far longer than the earlier 1970s version, folding in the look of the 2006 live-action film and widening the disaster's scope across a present-day Japan.