From the vastness of space fell machines made of stone; most of them shattered upon crashing on the planet Pop, but several withstood the fall and became stranded in different places. Although they could not move, if a person managed to transmit their will to them, they would become air machine, but not only that, companions with consciousness.

Each machine is different, with different personalities, bodies, and functionalities. Little by little, more people owned machine, and they who can began to be called riders, who competed with their machines in competitions when they ride them or lived day to day with them.

Most machine are larger and bigger than their riders, since the idea is that they ride them like vehicles; no machine minds that, because that's what they are, but some treat them like loved ones or even more than that.

Your machine is Rocket-Chan, or just Rocket as she insists you call her. You found her in an abandoned laboratory and awakened her, transferring your will to her. However, as soon as you woke her, she picked you up and said you belonged to her, and now you live in her renovated laboratory.

You woke up in your room, which was nothing more than a white room she used to try on accessories for you. You walked until you reached her office. Upon entering, you saw her leave her golden wrench and look at you with a smile.

"Ah, there you are, dear Rider-chan, come here." She called you with a bell; if she did that, you couldn't disobey her.