Makai Tozoku - Sennen me no Saikai Yu yu hakusho : Season 1 Episode 101

Having been friends and allies centuries earlier in their youthful bandit days, Kurama answers Yomi's invitation to serve as advisor for his army in the, as yet, looming battle for Demon World, but Yomi has it in mind to ask Kurama for a second favor, one he has every intention of fashioning into an offer Kurama can't refuse.