Koudou Ryou no Seiza na Hibi

One day, a girl visits the "Ecliptic Dormitory," a girls' dorm full of secrets, where the residents address each other by their zodiac signs. She meets the girls, each with such a unique personality: the steadfast Aries, a crybaby Pisces, the yandere Scorpio… And the Gemini who led the tour, who seems to be aware of "my" secret...?

(Source: ComicWalker, translated)