Darkness is actually Fujiwara Yusuke. Fujiwara speaks of the magnificence of the World of Darkness, but Fubuki opposes his thinking. Fujiwara activates the field magic Clear World, conferring a Negative Effect on Fubuki. On top of this, he summons a high level clear monster, Clear Vise Dragon. Clear Vise Dragon is a monster which increases it's fellow monsters' offensive abilities two-fold. Fubuki finds himself in a dire situation. And, unrelenting in his attacks, Fujiwara shows Fubuki the darkness in the hearts of Majoume, Asuka, Shou and the others.
You don't need it.