The Law of Ueki is a Japanese manga and anime series that follows a unique battle tournament where participants, known as Ueki's fighters, use special powers to compete. Each fighter is granted a specific ability, which they can use to defeat their opponents. The main character, Kousuke Ueki, has the power to turn trash into trees, showcasing the creative and often whimsical nature of the abilities in the series. The tournament is organized by God candidates, who seek to determine the next God by evaluating the fighters' skills and moral values. As the story progresses, themes of friendship, justice, and personal growth are explored, making it more than just a typical battle series.