Kohona's Dark Dragon

After hiei finished working with Yusuke and the gang, he was exploring around the Demon World when he found a mystery crystal on the floor so he grabbed but suddenly he was sent to another dimension where the world was trained by ninjas and now hiei must trained Naruto to master the Dragon of the darkness Flame so he could be the best ninja in the world also to become Hokage. Also Hiei starting to have feelings for the genjitsu mistress of konoha named kurenai yuhi.