Chou Robot Seimeitai Transformers Micron Densetsu

On Cybertron, the Autobots and Decepticons fight over the Microns, small Transformers whose power can greatly strengthen whoever controls them. Horrified by the war, the Microns flee across the universe and vanish.

Four million years later, three children on Earth accidentally awaken a dormant Micron signal. Their discovery draws both armies to the planet, making the children and the scattered Microns the center of a renewed war.