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Yumi is the main character of the anime series Maria-sama ga miteru, which is one of the most popular Yuri anime series made to date. The first time we see her she is in her first year at Lillian girls' Academy. She is very upbeat, and shows almost all her emotions on her face; a trait that many other characters notice and like her for. She meets Sachiko Ogasawara, who fixes her tie one day in front of the statue of the Virgin Mary, which is representative of the strict dress code of Lillian. A few days later she is asked to become Sachiko's petite soeur, which she refuses, because it was just an attempt by Sachiko to get out of the school play. Sachiko asking Yumi to become her soeur is a result of a bet that stated if Sachiko could get a soeur before the play she wouldn't have to be in the play, but her sister would take her place instead. This is because of Sachiko's fear of men, which she would have to conquer in a play that would have her dance with a man. Even though Yumi refuses this offer it only makes Sachiko more determined to make Yumi her sister. After the play is over, and Sachiko has preformed Yumi accepts the rosary, and becomes Sachiko's soeur, because she realizes that this time the offer is genuine. Yumi has some difficulty with this relationship, but her elder Satou Sei is always there to help her find the answer and learn to deal with Sachiko, who has a very delicate personality. Ultimately Yumi shows Sachiko the world from a perspective other besides that of a wealthy person. She is very close to Sachiko, and as a result the two are very closely associated with each other. Yumi is unable to decide how to take her relationship with Sachiko to the next level, even though the main obstacle Suguru Kashiwagi; Sachiko's fiance to be has stepped aside and given Yumi his blessing. She loves Sachiko unconditionally, and would do anything for her, but normally her aura of happiness is enough to please Sachiko. Yumi has several friends most notably would be Shimako Todo and Yoshino Shimazu, who are both fellow members of the Yamayuri council. During her second year Yumi is pressured to find a Petite soeur of her own. After struggling internally over two girls, she ultimately chooses Tōko Matsudaira as her petite soeur; however the extent of her relationships with Tōko and Sachiko is left to the viewer's imagination.
The soeur system is when an older member of Lillian girls' academy selects an older sister, which for Yumi is Sachiko, and a younger sister, which for Yumi is Tōko. These sisters support each other emotionally, and often develop strong friendships, and sometimes more intimate relations. When a younger student accepts an older student's rosary they are accepting the offer of sisterhood.