Yashahime: Princess Half-Demon

Night of the New Moon and the Black-haired Towa (1x12)

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Nikosen was a sage before evil consumed his soul and transformed him into a demon. Konton orders him to kill the Half-Demon Princesses. Nikosen’s ambush catches Towa at a bad time, when her demon powers are fading and she is slowing turning into a human.