The technology to create powerful cyborg soldiers has been released for public use by the Berühren Corporation. Those outfitted with robotic parts are known as the Extended. Juuzou Inui, one such Extended, was created as a soldier and has no memories of his former life. But now, after the war, he runs a business that takes care of Extended-related incidents around the city. Rumors of a renegade Extended that kidnapped a child reach his ears; lo and behold, as Juuzo returns to his office, a giant robotic man with a boy on his back crashes in, asking for help. While Juuzou could just turn the guy in and be done with it, something about this situation is too fishy to ignore. It seems that everyone wants hold of this kid and, whether he likes it or not, Juuzou must find out why this Extended is on the run, how it connects to the Berühren Corporation, and just how far the treachery runs in this city.

Picking up where season one left off, Juzo Inui (Gun Slave Unit Device 13) has Rosa's data. Although it seems like everyone wants it, either to expose it or to destroy it, really no one is interested in it. Wachowski, the leader of the anti-Extended terrorist organization Spitzbergen, attempts to coerce Tetsurō to use Harmony to command Juzo to destroy Gun Slave Unit Device 7, who works for Berühren. Juzo does eventually fight Seven, but -- between corruption and double-crosses -- Berühren still pulls all the strings. (Source: ANN)

Far from the hustle and bustle of urban life, and with only a single candy store and bus route to its name, the rural Asahigaoka is certainly not a place for everyone. Nevertheless, the village's children still manage to cheerfully spend their days exploring and having fun in the wilderness around them. One such child, Renge Miyauchi, the youngest of the group, looks forward to the entrance ceremony of the upcoming school year, signalling her entry into first grade and the beginning of her elementary school life. Attending the only school in town, Renge and her friends, seventh grader Natsumi Koshigaya and her eighth grade sister Komari, make the most out of their rural lifestyle, playing and studying everyday. Meanwhile, fifth grader Hotaru Ichijou has just moved to Asahigaoka from Tokyo, unaware of the numerous adventures and memories that await her.

Hotaru Ichijou's lifestyle completely changes when she leaves Tokyo and moves with her family to the isolated Asahigaoka village. Her new school has only five students including herself, all sharing a single classroom regardless of grade level. There are no convenience stores in the area, and it can take up to two hours for a bus to arrive. Nevertheless, Hotaru finds herself captivated by the countryside's charm thanks to her four unique schoolmates with whom she quickly forms a genuine bond. The most colorful of them is Renge Miyauchi, a first-grader who is often perceptive despite her age. However, no less intriguing are the three Koshigaya siblings: the quiet oldest brother Suguru, the petite older sister Komari, and the prankish youngest sister Natsumi. Having someone from the city join their cheerful little group enlivens the ordinary days in Asahigaoka. Not only does Hotaru bring firsthand knowledge from the alluring outside world, but her fresh outlook on life welcomes a blossom of change to their usual routine.