A 51-episode anime television series adaptation produced by Studio Deen was broadcast on TV Tokyo from April 2005 to March 2006.

While this leads many students to thoughts of greed and selfishness, Kosuke Ueki decides to take it upon himself to win this tournament to keep that power away from those that would abuse such a gift.

For some reason, everyone in the real world has lost their memory of their most important person, including his friends who participated in the tournament two years ago.

Written and illustrated by Tsubasa Fukuchi, The Law of Ueki was serialized in Shogakukan's Weekly Shōnen Sunday from July 25, 2001,[a] to October 13, 2004.

The third ending theme for episodes 33–42 is "Kono Machi de wa Dare Mo ga Mina Jibun Igai no Nani Ka ni Narita garu" (この街では誰もがみな自分以外の何かになりたがる) by The Ivory Brothers.

[34] The series was broadcast in the United States on ImaginAsian TV's Anime EnerG programming block starting on January 30, 2007.

While Geneon would still retain the license, Funimation would assume exclusive rights to the manufacturing, marketing, sales and distribution of select titles.

[42] A video game published by Bandai, titled Ueki no Hōsoku: Taosu ze Roberuto Jūdan!!

Carroll lauded the concept of Ueki's power to turn trash into trees and the humor of the series, but called it "another run of the mill shounen title".

He labeled Fukuchi's art style as "simple" and compared it to One Piece, as "there is vagueness in a lot of detail", but clarified that it is suited to the comedic tone of the story.

Martinson compared the content of the volume to the anime adaptation, and wrote; "at times the manga made less sense than the DVD did.

Santos also criticized its "sloppy" artwork, repetitive fights and the English dub, concluding: "Like its titular hero, The Law of Ueki seems energetic and full of promise, but right now lacks the necessary self-control to succeed.

Beveridge also criticized the series' artwork, which blends traditional and digital animation, calling it "disconnected at times" and that it makes it look like an "unfinished show".

and commented that the powers of the characters are similar to those from Fullmetal Alchemist, "with the conversion factor involved", highlighting as well the variety of ways in which they are used.