Yu Yu Hakusho: The Movie

It's summer break, and Yusuke and Kuwabara are enjoying their time by doing one of their favorite hobbies: getting into gang fights and kicking major butt. However, their vacation is cut short when Botan shows up and tells them that Lord Koenma, Prince of the Spirit World, has been kidnapped. The kidnappers demand the Golden Seal for ransom, a seal that is so powerful, that even King Enma, ruler of the Spirit World, could be overthrown if it's stolen from him. Yusuke, Kuwabara and Botan, along with their friends, have very little time to rescue Koenma, before he'll be thrown into lava. Yusuke can't give away the seal, but he can't let Koenma, the person who brought him back from the dead, be hurt either.

Synopsis from Anime News Network