She is a student at Moonlit Night Academy and is the elder twin sister of Kaguya Shirayuri. 
Sakuya is a cool-type idol whose preferred brand is Luna Witch. 
Along with Kaguya Shirayuri, the two are a part of Reflect Moon. 

"Let's go, together! Head for the goal, Diamond Friends!!" 

The new anime will have a theme of "Aikatsu with your friends!" and will center on a new protagonist named Aine Yuuki, who is good at making friends, and is enrolled in Star Harmony Academy's general education track. She befriends Mio Minato, the school's top idol, and becomes an idol herself. 

(Source: Anime News Network)

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Raki Kiseki is a second-year middle school student who transfers to Star Harmony Academy to become an idol. However, when she uses an Aikatsu Pass she received from her big sister (an Aikatsu engineer), something mysterious happens. Lots of doors appeared before her, and when she opens them, she meets Aikatsu idols she never knew before, such as Yume Nijino. Raki vows to design her own premium dress and perform in it on stage. (Source: Anime News Network)

Two years after the Diamond Friends competition, Aine Yuuki, now is in high school, have a unexpected encounter with the mysterious idol Hibiki Tenshou who wears the shining Jeweling Dress.

Sakuya Shirayuri