Yu-Gi-Oh! GX takes place 10 years after the original Yu-Gi-Oh!.
Ten years after the Ceremonial Battle, a teenage boy named Yuuki Judai heads off in order to join the Duelist Yousei School located on a remote island off the coast of Japan.
There he meets his fellow students and gains a few friends, along with a few enemies.
Judai is put into the lowest rank of Osiris Red, but he continues to test his skills against the students and faculty to prove his worth as a Yousei Duelist and earn the respect of everyone around him.