In the terrific ocean where those sea creatures live, everyone is scared of them they don't come out often but when they do doom comes over the country and everything is destroyed. Humans were giving up and was trying to go to other planet but there comes some new face to become Tidehunter as no one wants to because they know going to the sea is as same as accepting death. From year to year there are less and less peoples who wants to become a Tidehunter. Will They save the world? Or They will call upon Doom For Humanity?