"Yashahime: Princess Half-Demon" is a sequel to the popular anime series "Inuyasha," set in the feudal era of Japan. The story revolves around the daughters of the original series' main characters, blending themes of adventure, family, and supernatural conflict. The narrative centers on Towa Higurashi and Setsuna, twin half-demon sisters, and their cousin Moroha, the daughter of Inuyasha and Kagome.

Towa is separated from her family at a young age and transported to modern-day Japan, where she is raised by Sota Higurashi, Kagome's younger brother. Years later, Towa is reunited with Setsuna in the feudal era, but Setsuna has lost her memories and no longer remembers her sister. Together with Moroha, a brash and independent bounty hunter, the trio embarks on a journey to uncover their shared past and confront the forces threatening their world.

The plot is driven by their quest to recover Setsuna's lost memories and understand the mysterious Dream Butterfly, which is linked to her condition. Along the way, they encounter familiar faces from the original series, including Sesshomaru, the stoic and powerful demon lord who is the father of Towa and Setsuna. The series explores the dynamics between the new generation and their parents, delving into themes of legacy and identity.

The antagonists include Kirinmaru, a powerful demon with his own agenda, and his daughter Riku, who becomes entangled in the protagonists' journey. The story weaves together action, emotional moments, and supernatural elements, maintaining a balance between standalone adventures and an overarching narrative. The series expands on the lore of the original "Inuyasha" while introducing new characters and challenges, creating a bridge between the past and present generations.