"Stain" follows a young boy on a family picnic who unknowingly discovers the deep connection between littering and environmental destruction. When he carelessly throws trash on the ground, he is shocked to see the immediate effects—leaves wither, flowers wilt, and the once-beautiful landscape fades. This eye-opening moment changes him, making him realize how small actions can harm nature. He becomes more aware and starts taking responsibility for his impact on the environment. The film highlights the importance of individual actions in protecting the planet, encouraging viewers to be more mindful. With a touching story and powerful visuals, "Stain" delivers a strong message about environmental responsibility and inspires positive change.