The crew on the star ship Sakura are forced to land on an unknown planet due to ship damage. After meeting a group of aliens, also stranded on the planet, they need to learn to work together and escape the planet as an apocalyptic event is imminent. The aliens ask for help in rescuing one of their own and in exchange they will provide a spaceship for their escape. The only thing that's missing is element 115 for the ship to be able to fly.