Subaru was a middle school student who loved stargazing, but she was always alone at the Astronomy Club. Her childhood friend Aoi now goes to another school and the two have grown apart since then.

One day after collecting the first engine part, Subaru comes to school and finds that the four girls are now their classmates. While Nanako acts as the interpreter, the chairwoman, a Pleiadian woman, explains to Subaru that the five have come together from different timelines that would not normally cross.

Subaru and the others keep collecting engine parts while pretending to be a cosplay club in public. But the words of the chairman lead Subaru to harbor strong self-doubts.

Subaru and the others can now enter the stratosphere, but the next fragment appears in the orbit of the moon! After a word from Hikaru, Subaru and the others are starting training to travel the moon.

The school's theater festival is approaching and Subaru's class determines the cast for the stage play. Itsuki is allowed to play the main role as a princess, everyone agreed, but ... In the meantime, the meteor shower forecast shows another engine part.

The Plejdian spaceship, which has flown invisibly through the earth's orbit, is beginning to materialize. The girls' task of collecting the engine parts is becoming increasingly important in stopping this process.

Subaru falls into depression after losing sight of Minato. She takes care of the remaining flower from the greenhouse. To learn how to do it, she joins the gardening association. Aoi worries about Subaru when she sees Subaru's anger at her own ineptitude grow ever larger.

A part of the engine appears 0.25 light-years from Earth in the furthest corner of the solar system. It would take three months to get there at the speed of light, and to top it all off, someone would have to go ahead and pinpoint the location. The one who volunteers for this lonely trip is Nanako.

The cultural festival is getting closer. The cosplay club presents its costumes, and Subaru decides to create a simple planetarium for the astronomy club. Subaru was the only member, but now Minato is helping her and the work is progressing well. When Hikaru and the others see how close Subaru and Minato are, they plan to secretly register the two for the culture festival's couples competition.

The boy in black steals all the engine parts that were kept in the Astronomy Association in preparation for the cultural festival. But he goes even further and wants to take control of a brand new part of the stratosphere.

Subaru was able to get the engine parts back, but in return it lost its magical powers. As a result, she is plagued by horror and perplexity and the others are worried about her, but decide to make an effort and enjoy the cultural festival, as there is nothing they can do anyway.

On the hunt for the last engine fragment that has appeared beyond their galaxy, the girls reach the edge of the universe, where even the light is distorted, and find a black hole. According to the chairman, the fragment is in the middle of the hole and could disappear into another universe at any time! To prevent this, the girls have to be quick. Will you be able to get the last fragment to repair the spaceship engine?