Wish Upon the Pleiades

One day, while visiting her school's observatory in preparation for a meteor shower, a girl named Subaru comes across a mysterious greenhouse where she meets a frail boy. After leaving the room, finding it revert to the observatory before her eyes, Subaru encounters a small alien-like creature and follows it to a magically sealed classroom, where she comes across a group of girls in witch outfits, including her childhood friend Aoi. The girls and the creature, revealed to be a Pleiadian and the girls' president, notice potential in Subaru and give her a special broom, which brings her up through the clouds to a star-shaped gem that transforms her into a witch herself.

The next day, Subaru is surprised to find Aoi and the rest of the girls are all a part of her class, with her classmates seemingly having their memories rewritten. The Pleiadian believes this to be because of everyone's fates converging caused by his spaceship, which also seems to be related to Subaru and Aoi's contradictory pasts. With the story behind it put on hold, the girls teach Subaru how to ride her drive shaft, after which Subaru appears to be conflicted over her relationship with Aoi. She once again arrives at the mysterious greenhouse where the boy, Minato, assures her that Aoi is probably having the same worries as her. Taking his advice, Subaru and Aoi take to the skies to talk things over and become friends again.

As the girls feel downhearted over another loss against the cloaked stranger, not helped by the Pleiadian's harsh words, Subaru once again receives encouragement from Minato. Later, the cloaked figure attempts to steal another fragment from the girls, but a counterattack causes the fragment to wind up in the ocean, prompting the girls to dive in after it. However, some interference by the cloaked boy causes the fragment to launch up into the stratosphere. Managing to utilize Subaru's power, fellow member Itsuki helps bring everyone up to the stratosphere to obtain the fragment before the boy can.