Takeshi, a Japanese elementary student, is plunged into the mysterious Underwater World, where he joins the ranks of U.N.C.O.—a squad dedicated to thwarting the chaotic schemes of the antagonistic Pipes. Alongside spirited allies Jasmine and A-kuei, a sharp-witted Taiwanese classmate, he charges into battles to safeguard the world’s toilets from grimy chaos. Their adventures unfold through a whimsical blend of absurd humor and fantastical stakes, weaving global hygiene into surreal escapades against relentless foes.