Karin Kokubu, a 13-year-old middle school student, stumbles upon a mysterious yellow pig during her commute to school—later revealed to be Prince Tonrariano III, exiled royalty from the apple-shaped planet Buringo. After offering him an apple, she gains a magical compact housing a pig snout that fuses to her face, allowing her to transform into a superpowered pink pig by chanting “Ba Bi Bu Be Burin!” Though horrified by her porcine appearance, she reluctantly undertakes a quest to gather 108 pearls via heroic acts, hoping to evolve into a dazzling warrior akin to her idol, Cutey Chao.

Her superhero identity must stay concealed; exposure would lock her permanently in pig form—a peril amplified when classmates, including her crush Koichi Mizuno, idolize her alter ego. Koichi’s admiration for Burin clashes with Karin’s hidden feelings, while rival Keiko Kuroha’s envy and her journalist father’s relentless pursuit of Burin’s true identity add layers of tension.

Juggling school, friendships, and crime-fighting, Karin faces comedic blunders and ethical quandaries, gradually warming to her role. Key allies include best friend Masami, who aids her romantic endeavors, and Jimmy Matsumoto, whose sleuthing threatens her secret.

In the finale, her classmates uncover her identity during a crisis, activating the permanent transformation. This twist cements her arc from craving glamorous validation to championing self-acceptance, proving heroism lies in action, not appearance. Her passion for painting, bonds with her younger brother, and clashes with her father over dual identities enrich her journey, portraying the tumult of adolescence intertwined with extraordinary responsibility.