Yuna is the main character of the series. At first, she was just another normal schoolgirl: a first-year student at Yokohama's Shiraokadai All-Girls' High School, enrolled in class 1-B, commuting from home to school each day via the local train route. Sometime prior to the first game, Yuna and several other girls entered the "Miss Ojousama Contest", an intergalactic beauty pageant, with Yuna herself being chosen as the winner. In doing so, she became an instant celebrity, and began a career as a popular idol singer.

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