Grade schooler, Yuuta Tominaga, stumbles upon Deckerd, an incomplete humanoid robot that was initially constructed by the Japanese authorities to combat intricate criminal undertakings. As Yuuta steadily bonds with Deckerd, the robot starts to showcase emotions and displays characteristics that are more akin to that of a human being. By appointing Yuuta as the leader of the "Brave Police", a genuine partnership between human and robot is forged.