Wish Upon the Pleiades

Subaru goes to the school's observation room to observe the meteor shower, but behind the door, she finds a lavish garden and a mysterious boy with red hair. The garden disappears, leaving a blob creature that leads her to a room with other girls in magical costumes, including her childhood friend Aoi. Subaru learns she's been chosen by the blob, an alien Pleiadian, to join his group and help find pieces of his spacecraft engine to return him home. They're not the only ones searching for the engine parts, but Subaru's true intentions are unclear.