With a family that owns a jewelry business, a high schooler called Ange was named after the world’s largest pink diamond. At a glamorous party where ‘Ange’ is being displayed, she is told by a mysterious woman that although ‘Ange’ is beautiful, it carries a deadly curse. The next day, she visits the diamond again to find that the real ‘Ange’ has been stolen!
(Source: Manga Updates)

From Doko Demo Doa:
Five years ago, Chika received flower seeds from a “mysterious” boy, who asked her to grow them until they bloom. Five years later, the flowers have not bloomed yet, but another boy has come in front of Chika, and claimed himself as the “mysterious” boy. Is he really the boy in Chika’s memory? And will Chika be able to grow the seeds?

From Akimoto Nami's story Les Mille Fleurs a short romantic story about Chika's older brother Shin from when he was in 12th grade and a 10th grader by the name Ayana.

It is about a girl named cai young who seems to always fall for the wrong boys. Will she every find one who truely loves her? and maybe the person is closer to her then she really thinks.

From Tokyopop:
For all 15 years of their lives, Ami and Noa have competed against each other for love with the same results: both fall for the same guy, inevitably scaring him away and leaving them boyfriend-less. But the vicious cycle is broken when the girls go to a party and each fall for two different guys! With potential love on the horizon, the sky couldn't be bluer...until Ami discovers that these two dudes are actually duds with ulterior motives. Determined to get revenge on these players, Ami vows to make her guy fall for her while she trys to protect an unsuspecting Noa!

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Bitter rivals since kindergarten, Ami and Noa are always fighting over the same boys. Neither of them ever succeeds in getting their man and neither has ever had a boyfriend. Ami and Noa are 15 years old when they meet two cute guys called Tamon and Hiro. This time it is different: They don't fall in love with the same guy. Ami fancies Tamon. Noa likes Hiro. These guys, however, are a pair of crafty rogues, playing what they call "a harmless love game." Enter Mika, Tamon's ex-girfriend, and Miyamura, a weird teacher, both out to spoil Ami and Noa's plans.

Five years ago, Chika received flower seeds from a “mysterious” boy, who asked her to grow them until they bloom. Five years later, the flowers have not bloomed yet, but another boy has come in front of Chika, and claimed himself as the “mysterious” boy. Is he really the boy in Chika’s memory? And will Chika be able to grow the seeds?

Yuu is an energetic girl who's trying her best to keep close to her boyfriend Roku, a student from another school and very busy with club activities. When he has to be away for winter's vacations, will her efforts still be enough?

Meet Toni and Mika-identical twins as different as day and night. Toni is a star athlete, out-going, and popular. Mika is shy, quiet, and academic. Although they look like ordinary junior high school students, when they unite, these twins produce Miracle Powers. Telepathy, teleportation, and magic are all used to help the girls get through the day. Nobody knew about Toni and Mika's powers until a nosey classmate discovered their secret. Can the twins keep their powers a secret or will they be exposed to the world?