Fiasse is calm and gentle, and is the headmistress of the Crystera Song School, located in England, and is a world-renowned singer. She hires her childhood friends, Ellis, Kyouya, and Miyuki, to be her bodyguards after receiving threats from an unknown organization. They are threatening to kidnap Fiasse and steal her inheritance from her mother, who was also a famous singer. Fiasse and her school are in the midst of preparing for their annual charity world tour, which Fiasse is stubbornly set on doing, despite the danger.