The Heroine's background changes with each route, as the location(s) of the Three Sacred Treasures and how she escaped her residence differs. She fled her home and went unconscious with a concussion on the mountain from Kyoto, having fallen off a horse named Kurodayu. 

She is the only daughter of the noble Kushinada family, in which they were aligned with the Emperor. They were worshiped and were entrusted to protect and perform rituals surrounding the Three Sacred Treasures: Yata no Kagami (mirror), Yasanaki no Magatama (jewel), and Amenomurakumo no Tsurugi/Kusunagi (sword). The Heroine had an education in politics by her father, in spite of her status as a female noble. While she feared her father when she was younger because of his strict behavior, she knows that he was ultimately a good, caring person. She knows how to cook, as shown by her skill in preparing food by chopping vegetables with a knife. Her hands do not look like those with servant labor, though, and it is evident that she had learned etiquette. Her family of three used to have servants. Having lived in the capital, the Heroine did not learn how to swim. She is not confident in her appearance and does not understand others.

According to Destiny Ninja 2+, the Heroine had written scrolls instructing and foretelling things regarding that descendant. She was cursed, and the guilt she had turned her spirit into a monster.