Naoko Watanabe navigates teenage life as a student hiding a volatile secret: uncontrollable transformation into Gauko, a fire-breathing dinosaur entity, triggered by anger. Her ordinary schoolgirl appearance features curly brown hair, a yellow top with a white collar, and a pink skirt, starkly contrasting her dinosaur form. Typically shy, secretive, and bubbly, Naoko suppresses intense emotions to avoid transforming. She adores poetry, flowers, strawberries, and pudding but dislikes sports, unpleasant situations, and specific antagonizing individuals. Her core concerns involve preserving friendships and concealing her condition, complicated by a romantic attraction to classmate Toshio Hiraga, initially drawn to his looks and later his personality. Key relationships define her struggles. Friends Kana and Erika offer unwavering acceptance despite Gauko’s disruptions, valuing her uniqueness. Conversely, she resents Bibilian, an alien whose persistent romantic pursuits and chaos negatively impact her, and frequently clashes with provocateur Takashi Yamada, who deliberately incites her transformations for amusement. Her family includes parents whose cooking she savors, and she shares a close, brotherly bond with Leonard. As Gauko, Naoko gains escalating powers fueled by anger: superhuman strength to hurl people or demolish structures, durability to survive extreme falls and explosions, intensely heated fire breath, size expansion proportional to rage, heightened smell, and a signature combat technique reminiscent of a noted anime move. Though Gauko often rages, she occasionally displays fear, happiness, or sadness. Naoko’s journey centers on managing this duality. Initial efforts focus on stifling anger to prevent exposure, but scenarios—like being trapped in dinosaur form—force reliance on others to revert. Antagonists like Bibilian and engineered threats (Mecha Gauko, Robo-Toshio) push her to wield Gauko’s powers defensively. While her core struggle persists, experiences hint at gradual adaptation in balancing school life, friendships, and her explosive secret.