Shukumei no Taiketsu! Arashi no Taisho Sen Kaishi Yu yu hakusho : Season 1 Episode 61

Before even the first punch can be thrown, Younger Toguro's aura of demon energy is enough to melt the flesh off weaker apparitions in the stadium, causing Koenma to act quickly to protect Yusuke's teammates, while Puu does likewise for their friends in the stands. Several former adversaries also arrive to watch the final match.