Fio is a shape-shifting alien high schooler, but she isn't allowed to use her special power. It's supposed to remain a secret. But sometimes for teenagers it's hard to hold back their hearts. Fio has a plan how to get closer to her big crush, but she will have to use her powers in order to do so.

After an outer-space accident, Mikael, a tiny journalist, decides to stay and help Astrée, pilot of an interstellar greenhouse ship. Together they help take care of a group of gassy survivors of a destroyed planet and hundreds of precious plants. But soon something mysterious shows up on the ships radar.