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Starry☆Sky centers around Tsukiko Yahisa, the sole female student at Seigetsu Academy, a school recently transitioned to co-ed and specializing in astronomy.
Surrounded by her childhood friends, Kanata and Suzuya, she navigates the challenges of being the only girl in a school full of boys.
As Tsukiko settles in, she encounters thirteen unique male students, each representing a different Western zodiac sign.
The anime follows her experiences and relationships with these boys as she becomes further involved in their lives and the complexities of the academy.