Subaru, a young stargazer, stumbles upon a peculiar indoor garden instead of her school's observatory one day. Meeting the enigmatic Minato, she is urged to depart abruptly. Things take a stranger turn when she encounters a whimsical creature snatching her compass, leading her to a club room where girls don witch attire. Spotting her friend Aoi among them, Subaru defies objections and joins the group. Gifted with a mystical staff and a magical change by the club's leader, a blobby being called Pleiadian, Subaru learns of their quest to find spaceship engine fragments. These pieces are crucial for the Pleiadian's journey back home. However, rival seekers are also on the trail, setting the stage for an intriguing adventure.