Towa and Setsuna were once happy in Feudal Japan, until a forest fire tore them apart. Towa was hurled through a portal and found herself stranded in modern-day Japan. Luckily, Souta Higurashi rescued her and became her adoptive father since she had no means to return home. Ten years have passed, and Towa is now a 14-year-old student who has adapted well to her new life, except for occasional conflicts. Suddenly, three unexpected guests arrive from Feudal Japan: bounty hunter Moroha, Setsuna, Towa's long-lost twin and demon slayer, and Mistress Three-Eyes, a demon on a mission to retrieve a magical artifact. Together, they band to fight their enemies, but Towa is shocked to discover that Setsuna has no recollection of her. In the Hanyou no Yashahime: Sengoku Otogizoushi series, they travel together to regain her lost memories and uncover the truth about their linked fates.