Moment From Yashahime: Princess Half-Demon S01:E11

Two demons for the price of one.
Towa discovers she is immune to poison vaper and Setsuna is immune to poison. So they use this knowledge in their battle with this poisonous pond demon who merged with a snake demon.

Yashahime: Princess Half-Demon
S01:E11
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Something wicked lurks in the Man-Eating Pond, devouring any human, beast or bird that comes near. Towa and Setsuna meet Hikomaru and Chiyo, siblings who lost their parents to the pond.
Tags: NTV, supernatural, dementia, demon, historical, spin off, super power, temporal travel, shounen, anime