In 2145, the earth was divided into the Federation and the Free Alliance after a resource catastrophe, and mechas became the sharp blade of the separatist war. Ling Mo, a former federal ace pilot, retired due to guilt due to a fatal mistake. He survived by repairing civilian mechas in an abandoned industrial area until a raid by the Alliance army broke the peace. In order to protect the mechanic father and daughter who took him in, he was forced to activate the dilapidated "Scavenger", and his former talent was accidentally exposed.
