Marielle is a young girl currently living in a remote house deep in the mountains between Switzerland and France to recover her health. The story is told through the memories of her adventures with Memoru, a tiny alien girl who lives on a nearby island. Her people are gnome-like beings who are stuck on Earth after their spaceship crashed here.

A remake of episodes 51-52 of the TV series, the 999 crashes in a large sentient blob along with another ship. The crew tries to save the ship's pilot, a blue haired woman named Artemis, before the Galaxy Railways headquarters gets ready to blow up the blob.