Starry Sky: in Spring Portable

Tsukiko Yahisa is the first female student to enroll at Seigetsu Academy, a former all-boys school specializing in astronomy. She is closely watched over by her childhood friends, Kanata Nanami and Suzuya Tohzuki, who often protect her from the male student body. Throughout the games, she befriends other young men whose personalities are based on the Western zodiac constellations.

Starry * Sky: In Spring - Portable is an otome game, developed by honeybee and was released in Japan in 2010.