Yu Yu Hakusho: Forever is set after the events of the Dark Tournament. Although a great deal of time was spent fighting in the tournament, it appears only a day has passed in the human world. As Yusuke and his friends return home they discover a man named Sensui plans on destroying the Earth by making his right hand man Itsuki open the demon plane into the human plane. After defending the world from destruction, Yusuke and his friends join the Demon World Tournament to fight the Three Kings.