The third and youngest princess of the Nebulis Sovereignty, she is the bearer of a "Light star spirit", which allows her to see past events. Sisbell has a calm and polite personality. Despite being the youngest sister and reserved, this does not stop her from doing what she believes is best for her nation, she is willing to use underhanded methods to achieve her objectives. A year before the main storyline starts, Sisbell was a captive in a detention center of the Heavenly Empire. Iska, saw Sisbell being captured, decided to break Sisbell out for the reasons of her not having much power and being younger than him. After breaking Sisbell out, Iska hands a few silver to her for her to get a loop bus to a neutral city. Sisbell didn't trust Iska, but still takes the silver and runs. After getting off the bus at a Nebulis Sovereignty encampment, Sisbell was in disbelief that Iska truly wanted her to escape. A day later, Sisbell finds out Iska, the youngest Saint Disciple in history, was given a life sentence of imprisonment for treason against the nation and aiding the escape of a witch.