Yashahime: Princess Half-Demon (2020)

S1E12 Night of the New Moon and the Black-haired Towa

Once a wise sage, the demon Nikosen fell into darkness, allowing evil to take over his spirit. Under Konton's command, he is sent to eliminate the Half-Demon Princesses. Meanwhile, Towa faces a difficult challenge as her demonic abilities begin to diminish, forcing her to transform into a human.