Setsuna Izayoi is a main character in the anime series "Hanyou no Yashahime." She is the daughter of Sesshomaru and Rin, and the twin sister of Towa Higurashi. Setsuna is a demon slayer working for the demon slayer corps, and she is known for her calm and serious demeanor. Unlike her sister Towa, Setsuna has no memories of her childhood due to a dream butterfly that took them away. Her role in the series involves battling demons and uncovering her lost memories, all while maintaining her strong yet reserved personality.