Setsuna

Setsuna (せつな) is the deuteragonist in the anime series Hanyō no Yashahime. Setsuna is a half-demon demon slayer who works under Kohaku. She was separated from her older twin sister Towa when they were both 4 years old but was reunited with her after traveling to the future with her cousin Moroha. She seems to have difficulty believing Towa is really her sister.