Koko functions as a magical guide, introducing the ocean environment to the protagonist by facilitating a journey to experience the sea's initial tranquility. This action directly enables the central characters' subsequent adventure. Her early narrative involvement sets key events into motion, escalating when an antagonist disrupts the revealed peaceful setting, immediately endangering a supporting character amid the resulting chaos. Koko's role centers on initiating the transition from the ordinary setting to the oceanic realm, concluding her contribution to the storyline without further elaboration on her origins, motivations, or activities beyond this function.