Sanna, an innocent and hardworking 11-year-old schoolgirl, spends her days exploring the city and singing to her heart's content. Unaware of her unusually large breasts, she is easily swayed by the praise and attention of others. One day, she bumps into a stranger, and the two strike up an unlikely friendship. As they spend more time together, Sanna begins to experience new and unfamiliar sensations, forcing her to confront the realities of her body and her burgeoning desires.