In a dystopian not-too-distant future in Japan, a boy takes on a robot army to regain his freedom—with the help of a few powerful friends.Young Hiro has been hiding out for months with the mysterious robot who saved him and his yojimbot companions from the vicious onslaught by Topu's drone army. But he can't stay hunkered down forever. He and his friends have to find a way out before the island's security forces close in, including a foe Hiro thought he'd seen the last of. The path ahead is full of danger, but freedom awaits Hiro at the end—as well as an earth-shattering revelation. Once more, Hiro and his yojimbot companions are saved in the nick of time from the advancing drones by a resourceful robot whose real identity will stun everyone. They manage to push through together to the old port, only to find out it's not as abandoned as they thought. Will Hiro and his friends finally discover the truth behind their island prison? And most importantly, will they be able to make it back to the mainland in one piece?