Nura: Rise of the Yokai Clan S01 E06 A Trap is Set on the Evil Mountain

"When night falls, they rule Tokyo."

Rikuo and his friends reach the mountain retreat. While the girls are in the onsen Rikuo, the boys and Tsurara set off to look for sprits. Kana decides to follow them since she's jealous of the relationship Rikuo and Tsurara share. Meanwhile Guyki orders his minions to kill them all. After being separated from the group Tsurara is attacked. Just as she's about to be killed Rikuo saves her in his night form.