les hing ▁out ▁forgotten ▁side ▁characters ▁such ▁as ▁L ago on ▁Boy , ▁T ula ▁( A qu ag irl ), ▁Black ▁Jack , ▁and ▁others . ▁After ▁the ▁events ▁of ▁D rown ed ▁Earth ▁Arthur ▁losses ▁his ▁mem ories , ▁he ▁finds ▁himself ▁living ▁amongst ▁an ▁enc lave ▁of ▁island ▁dwell ers ▁making ▁their ▁home ▁on ▁Un sp oken ▁Water . ▁ ▁Un be known st ▁to ▁him , ▁however , ▁this ▁habit ation ▁is ▁a ▁place ▁set ▁within ▁the ▁S phere ▁of ▁the ▁God s ▁where ▁forgotten ▁sea ▁de ities ▁go — e ither ▁when / after ▁they ▁per ish , ▁fade ▁from ▁their ▁worship ers ' ▁mem ories ▁or ▁simply ▁forget ▁their ▁role ▁in ▁serv icing ▁the ▁ocean ' s ▁maj esty . ▁One ▁such ▁god dess , ▁who ▁was ▁actually ▁a ▁prim ord ial ▁ade pt ▁from ▁before ▁time , ▁be gr ud ging ly ▁makes ▁her ▁home ▁on ▁a ▁separate ▁island ▁adjacent ▁to ▁that ▁of ▁the ▁div inity ▁who ▁bet rayed ▁her ▁and ▁her ▁depart ed ▁husband . ▁N amma , ▁whose ▁real ▁name ▁is ▁actually ▁Mother ▁Salt , ▁has ▁every ▁intention ▁of ▁d row ning ▁the ▁world ▁in ▁br ine ▁with ▁the ▁intended ▁consequence ▁of ▁killing ▁everything ▁that ▁lives ▁and ▁breath es ▁on ▁it ▁in ▁reven ge ▁and ▁to ▁start ▁over — rem aking ▁the ▁universe ▁in ▁her ▁own ▁image . ▁ ▁With ▁the ▁help ▁of ▁one ▁of ▁N amma ' s ▁cast - off ▁cre atures — ne eded ▁to ▁reg ain ▁her ▁full ▁power ▁as