Basara Toujou's life changes forever when his father remarries Mio Naruse, a demon princess, and her sister Maria. The sisters reveal they’re being hunted by rival demons, and Basara must protect them using his hidden powers. As battles erupt and romance grows, Basara finds himself drawn into a dangerous world where family, loyalty, and love are put to the test.

Basara Toujou's life changes forever when his father remarries Mio Naruse, a demon princess, and her sister Maria. The sisters reveal they’re being hunted by rival demons, and Basara must protect them using his hidden powers. As battles erupt and romance grows, Basara finds himself drawn into a dangerous world where family, loyalty, and love are put to the test.