An unfortunate airplane accident has left Homare Onishima, Asuka Suzumori, Mutsu Amatani, and Shion Kujou stuck in the middle of the ocean. Fortunately, the girls were able to find an island to take shelter. Stranded in the middle of nowhere, the girls must use their wits and resources to survive on the island. What do they need? Food, clean water source, shelter from the elements, and security. And let's not forget that they need to keep their cool! Things may seem grim, but luckily, Hormare has a bit of wilderness training under her belt.

It’s 2063, an era where space travel is the norm and accessible to all. We are introduced to Aries Spring, a cheerful teen stoked about going to summer camp on the planet McPa, which is relatively distant from her current location. Unfortunately, as she waits to board, a purse-snatcher gets away with her bag. However, Kanata Hoshijima, school jock, dashes after the thief and retrieves her bag. Later, Aries comes to learn that Kanata, along with other schoolmates—Luca, Charce, Yunhua, Funicia, Quitterie, Zack, and Ulgar-- will be traveling with her to summer camp.

En route to the campsite, a mysterious black sphere engulfs their ship, sending the nine passengers far across the galaxy. The situation is grim as they are stranded without a clue on how to get back. However, when they find a ship that can potentially get them home, they realize that the return journey will be longer than expected. Can the Astra sustain the nine back to their part of the galaxy?