

About
When Yumi Fukuzawa entered the Lillian Girls' Academy, a prestigious all-girls Catholic school in Tokyo, she never imagined she would catch the eye of beautiful and demure Sachiko Ogasawara, one of the school's most popular students. Now Sachiko has offered to be Yumi's soeur, her "sister" and guide for all her years at the academy. The whole idea has Yumi completely flustered—after all, they hardly know each other! The entire campus is abuzz with rumors about the two of them, but Yumi is conflicted over accepting Sachiko's offer. While she admires Sachiko, being her soeur would also mean constantly being at the center of the entire school's attention!
Cast
Seasons

Season 1
When Yumi Fukuzawa entered the Lillian Girls' Academy, a prestigious all-girls Catholic school in Tokyo, she never imagined she would catch the eye of beautiful and demure Sachiko Ogasawara, one of the school's most popular students. Now Sachiko has offered to be Yumi's soeur, her "sister" and guide for all her years at the academy. The whole idea has Yumi completely flustered—after all, they hardly know each other! The entire campus is abuzz with rumors about the two of them, but Yumi is conflicted over accepting Sachiko's offer. While she admires Sachiko, being her soeur would also mean constantly being at the center of the entire school's attention!

Season 2 ~ printemps
The spring term is beginning for the students at Lillian Girls' Academy. Friends are reunited, but for the Yamayuri Council, it's a bittersweet time. Yoko, Eriko, and Sei are busy preparing to depart Lillian while Sachiko, Rei, and Shimako are doing their best to ensure that their dear sisters receive a memorable commencement. Sei's departure will leave a sizable hole in the White Roses, and filling it won't be easy. But is there anyone who could appeal to Shimako enough to become the next Rosa Gigantea en bouton?

Season 3
Summer has arrived at last, and with it comes the promise of summer break for the students of Lillian Girls’ Academy. Sachiko and Yumi retreat to the summer home of the Ogasawara family for a season of rest and relaxation, but their rosy trip soon sours when some old friends of Sachiko’s unexpectedly drop in. These wealthy snobs turn up their noses at Yumi and Sachiko’s relationship — and if Yumi isn’t careful, her blissful summer at Sachiko’s side could come to an abrupt and tearful end.

Season 4
Life for the young women at Lillian Girls’ Academy couldn’t be more exciting! The Yamayuri Council is working on a theater production with the all-boys Hanadera Academy, and the school festival is quickly approaching. But Yumi’s duties pale in comparison to the task assigned to her by Sachiko: choosing someone as a petite soeur! Will she be able to handle the pressure of such a monumental decision, or will Yumi crumble under the weight of the Council’s — and Sachiko’s — expectations?
Episodes
Season 1

The Troubling Declaration of Sisterhood
Fukazawa Yumi's tie is fixed by Ogasawara Sachiko, her idol and the school's star, setting off a chain of events which would throw the shy and ordinary girl into the world of the prestigious student council. After Yumi walks in on Sachiko arguing with the Yamayuri Council over the school play they will be performing, Sachiko suddenly asks Yumi to be her petite soeur in an attempt to force her way out of the lead role.

An Unnerving Duet
Yumi is hounded by the school newspaper for a report on why she turned down Sachiko and endures dance lessons with the Yamayuri Council and a piano duet with Sachiko. Through various people, Yumi learns more about Sachiko and Suguru Kashiwagi, the one who will be playing the Prince in the Cinderella play.

The Moon and the Rosary
Yumi finally meets Kashiwagi when he comes to Lillian for the dress rehearsal, and learns a shocking secret about his relationship with Sachiko. Sachiko's true reason for her refusal to play the lead role is understood, making the bond between her and Yumi truly genuine.

The Yellow Rose Revolution
The rest of the Yamayuri Council find out that Yumi finally accepted Sachiko's rosary. Meanwhile, Shimazu Yoshino and Hasekura Rei are voted the school's best sœurs due to their respective girly and bishonen appearances, but Yumi talks to Yoshino and finds out that there's more to the pair than meets the eye and that the relationship between the two is far from perfect.

The Fighting Maidens
While Rei is reeling over Yoshino's shocking announcement, the bulk of the school copies them by breaking their soeur relationships too. Tori Eriko, Rei's soeur, isn't even aware of the problem due to her odd behavior and suspiscious absence from school. Yumi goes to the hospital to talk with Yoshino, and learns the true nature of the Yellow Rose soeurs. Yoshino tells her all about her plan to make Rei a stronger person.

Rosa Canina
A second-year student calling herself Rosa Canina runs against the en boutons in the Yamayuri Council elections with murky intentions. Todo Shimako hesistates to run at all due to her first-year staus and her reluctance over taking a leading council position until a talk with Rosa Canina forces her to make a decision. Yumi confronts Sato Sei, Shimako's soeur, over her refusal to encourage Shimako to run, and learns more about the relationships between older and younger soeurs and how to best support Sachiko.

Surprising Chocolate - Part I
For Valentine's Day, the Lillian Newspaper Club organizes a treasure hunt in which the winners would get half-day dates with the en boutons. Yumi agonizes over what to get Sachiko for Valentine's Day, resulting in a spectacular misunderstanding between the two of them.

Surprising Chocolate - Part II
After a crying Yumi runs away from Sachiko's confrontation, Sei reveals the secret reason behind Sachiko's distress. The treasure hunt takes place with surprising results. and Yumi makes up with Sachiko in her own unique way.
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