Tristan is about to turn fifteen. He enjoys the good life his parents have built for him. And yet, it won't be long before his environment of protection, affection and comfort crumbles. From then on, he will learn the taste of loneliness, sadness and that survival is often more important than life.

A father and a teacher turning a boy, Rin, into a robot for better academic achievement. Rin and Si Qi decides to get out of the city by making a mechanic dragon.