Starry Sky takes place at Seigatsu Gakuen, a school which specializes in horoscopes, astronomy and other related topics. The main characters are all based on horoscopes. Starry Sky Spring features Suzuya Tohzuki (Cancer), Kanata Nanami (Pisces) and Yoh Tomoe (Capricorn). It follows main character Tsukiko Yahisa, who's the first girl to enroll in the school, and her first semester there, which she spends with her childhood friends Suzuya and Kanata along with Yoh, a transfer student who came from France.