Nura: Rise of the Yokai Clan S02 E03 Keikain Yura's Realization

"When night falls, they rule Tokyo."

Ryuji Keikain uses his Shikigami “Gyogen” to attack Rikuo, who defends himself with his blade. Ryuji halts his attack when he recognizes the blade as “Nenekirimaru,” a Spirit Blade that can only cut down yokai.