Armageddon.Lunar has gained weight and insists that Sun go on a diet with her and buys exercise equipment and dietary supplements for mermaids through the Seto home shopping channel and builds a gym in Nagasumi's house. Nagasumi drinks an entire bottle of mineral water designed for mermaids and immediately grows to an enormous height, destroying his parents house. Attempts are made to restrain Nagasumi, including wrestling with Octopus Nakajima and being hit in the groin with Kai's submarine. When that fails Kai uses his NASA contacts to launch Nagasumi to the moon and blows him up with rockets. Nagasumi survives and Sun's mother arrives with the Neptune Lance, a magical item from the Seto home shopping channel that can fix physical flaws. Sun eventually succeeds in throwing the lance to the moon where it hits and cures Nagasumi, shrinking him to normal size and returning him to earth. After reuniting with Sun Nagasumi is punished by his father for destroying their house.