Nura: Rise of the Yokai Clan

Tamazuki and the Seven Shadows (1x12)

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Nurarihyon kills the yokai that attacked them while Yura is distracted. After the fight he disappears to look into this incident. While Rikuo is heading home he runs into Tamazuki, the figure behind all the attacks. Tamazuki informs Rikuo of his plan to take over and destroy the Nura clan.