As the Creature Girl Harem King, Daisuke is always looking for new monster girls for both his scientific and erotic explorations. His latest tryst is with mermaid princess Kana's fish-tailed maids, who are only too happy to get their hands (and fins) on an otherworlder like him. Daisuke's continuously using his modern scientific knowledge to create new contraptions, this time creating vehicles never-before-seen in the world he now calls home, and the local ladies love him all the more for it. Meanwhile, as winter settles over the Death Mountains, Daisuke's old friend Oritsue prepares to negotiate an alliance with several nearby demihuman species...