Dasha, nicknamed "Little One," is in love with her older sister Nastya's boyfriend. Wanting to be closer to him, she constantly intrudes, disrupting their relationship and pestering her sister with questions about him. Oblivious to the seriousness of Malaya's feelings, Nastya decides to teach her a lesson, but the "lesson" goes too far. "Little One" is a film about competition, intimacy, and the boundless love of sisters.