Ryota Koji, a man who owns his own business and lives in the lower city's, finds a young girl he knows is a runaway. Leaving her where he found her is the best thing to do... right? Of course it is! But does Ryota care? Of course he doesn't! So, he adopts her. big mistake, and he realizes it too late. Above all of that, the world government, NanoTech is after Hoshi and will do anything to find her