Hibio's mother, an adventurer, faces a hindrance during her quest to investigate an enigmatic tribe. However, her luck changes when Nima, a lovely girl, spots a family portrait and sets her heart on marrying Hibio. In exchange, Nima is offered an opportunity to advance her own research. Nima accepts the proposal without consulting Hibio about his future partner. Chaos and hilarity ensue when Nima arrives in Tokyo to start a life with her new husband, and Hibio, with his contemporary Tokyo upbringing, meets Nima's mystical ancestry.