"Starry Sky" is a romance anime series adapted from a visual novel, set in a fictional all-boys boarding school called Seigetsu Academy. The protagonist, Tsukiko Yahisa, is the sole female student admitted to the school, which is traditionally male-dominated. The narrative revolves around her interactions with the male students, each of whom is associated with a zodiac constellation, reflecting their personalities and roles in the story.

The series is divided into four seasons, each focusing on a different group of characters corresponding to the four seasons of the year: Spring, Summer, Autumn, and Winter. In the Spring arc, Tsukiko becomes involved with the Astronomy Club, where she meets the club members: Kanata Nanami, a cheerful and energetic individual; Suzuya Tohzuki, a calm and composed figure; and Ryunosuke Miyaji, a serious and disciplined student. Their relationships develop as they navigate school life and personal challenges.

The Summer arc shifts focus to the student council members: Haruto Asahina, a playful and flirtatious character; Shun Utsumi, a reserved and thoughtful individual; and Soshi Kagura, a mysterious and enigmatic figure. Tsukiko's interactions with this group reveal deeper layers of their personalities and pasts, adding complexity to the narrative.

In the Autumn arc, the story centers on the school's sports teams, introducing characters like Kazuki Shiranui, a passionate and determined athlete; Hayato Aozora, a kind-hearted and supportive friend; and Yoh Tomoe, a quiet and introspective student. This arc explores themes of teamwork, ambition, and personal growth as Tsukiko becomes more integrated into the school community.

The Winter arc concludes the series with a focus on the school's disciplinary committee, featuring characters such as Tsubasa Amaha, a protective and loyal individual; Kakeru Satsuki, a mischievous and carefree spirit; and Kazahaya Mizushima, a diligent and responsible student. This arc ties together the overarching narrative, resolving lingering conflicts and deepening the emotional connections between the characters.

Throughout the series, the zodiac motif is a recurring element, with each character embodying traits associated with their respective constellation. The narrative blends slice-of-life moments with romantic developments, as Tsukiko forms bonds with the male students, each relationship offering a unique dynamic and emotional depth. The series balances lighthearted interactions with more serious themes, creating a multifaceted portrayal of adolescence and interpersonal relationships.