In the Kingdom of Granbel, a long-deserted amusement park, the mechanical teenager Shiki has lived alone between the cold gears and circuits since his birth.However, the peaceful day was broken, and Rebecca and her loyal cat companion, Harby, appeared in front of the rusty gate of the park.They didn't know that this was the first time in a century that someone had stepped into this sleeping land. While Shiki clumsily tried to understand the meaning of "friendship", the old mechanical neighbors were ready to move due to uneasiness and misunderstandings, brewing a mechanical rebellion against humanity.Home is no longer safe, and as the war approaches, Shiki has to set foot on Rebecca's small spaceship, escape from his hometown with this newly-acquainted human friend and sail to the vast sea of stars. This is not only a journey of escape and escape, but also a story of a lonely soul gradually awakening and growing up in warmth and trust.