A ghost escaped Momo at the end of the first game and dove into the ocean, possessing marine animals along the way. Now Momo must pursue it through five descending stages of underwater combat, facing an immortal jellyfish, a bank of bogues, a vampire squid, and an anglerfish before reaching a final showdown with an underwater volcano. Two new techniques expand the combat options: drawing a circle raises a shield that absorbs a single hit, and tracing a spiral sends every nearby monster flying backward.