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.

The girls, learning that the next fragment is located in the Moon's orbit, are trained rigorously to prepare themselves to leave Earth. They also hear about a piano concert held by Hikaru's parents, who are trying to send piano music into space, much to the dismay of Hikaru herself, who barely gets to see them. Later, as the girls head for the Moon, they are once again interrupted by the cloaked boy, who ends up causing a blast. After having a dream, in which she laments to Subaru about not being able to listen to her father's song that she altered by herself, Hikaru awakes to hear the song being sent from Earth by her father, who believed a note she left that said she would be on the moon. After using the cloaked boy in order to catch the fragment, Hikaru manages to hear that her father kept the note she added to the song.

Aoi and Itsuki are chosen to play the prince and princess in a class play for the upcoming cultural festival. After encountering Minato again, Subaru hears from Itsuki about how, when she was younger, she got herself in an accident for which her brother got blamed, which led her to be conscious about causing people trouble with her own desires. Just then, as another fragment appears, the girls wind up on Saturn's rings, where they are once again confronted by the cloaked boy.

A mysterious band of light appears in the sky, which is revealed to be a faint remnant of the Pleiadian's spaceship that is slowly materializing. After recovering a fragment and returning it to the clubroom, Subaru discovers it to be a fragment that the cloaked boy had captured, using it to track the girls towards their base. Trapped inside the school by the boy's magic, which locks the others out, Subaru flees from the cloaked boy and comes across the greenhouse, where Minato reacts strangely to the earring that emerged from the fragment. Minato sends Subaru further into the garden to a door, which opens up the observatory doors, allowing the other girls to enter the school and pursue the caped boy, who brings the school into space in order to fight against them.