The Angel Brigade, an elite branch of the Transbaal Empire military, are assigned to search for The Lost Technology, mysterious items from the past that hold unknown powers. Led by the soon to retire Colonel Volcott O' Huey, the Angel Brigade travel to different planets using their specially designed Emblem Frame ships to search for Lost Technology. Unfortunately, they usually mess up somehow and end up getting into all kinds of weird and troublesome situations. (Source: ANN)

In the far future, the human race advanced to space, and prospered. However, Jikushin ( earthquake of time and space ) which occurred suddenly intercepted all networks, and all the civilizations were reset. However, the human race begins to revive, and enters the prosperity age of The Second by the Transvaal imperial country which rises at the center of the galactic system. The science and technology before the civilization was reset, that is, "Lost Technology" was considered to be god`s task. And, it came to be worshiped by the priest who was called "Tsuki no miko". On the other hand, a certain guard fleet was stationed in the frontier of the galactic system. Though it was the seemingly perfectly ordinary army, the team composed only of the woman called "Angel Corps" existed in this army. They controlled the spaceship which was called "Angel Frame" which was the relic of Lost Technology. And, they collected the lost technology by using the angel frame, and carried out the duties to manage them. They were not the elite pilots, but Angel Corps was rather an eccentric person`s group. Arms mania`s Forte, costume player`s Mint, taciturn Vanilla, showy Ranpha and Milfeulle who likes cooking ... Every time, they cause a big trouble in the mission. (Source: AniDB)

When Subaru Natsuki leaves the convenience store, the last thing he expects is to be wrenched from his everyday life and dropped into a fantasy world. Things aren't looking good for the bewildered teenager; however, not long after his arrival, he is attacked by some thugs. Armed with only a bag of groceries and a now useless cell phone, he is quickly beaten to a pulp. Fortunately, a mysterious beauty named Satella, in hot pursuit after the one who stole her insignia, happens upon Subaru and saves him. In order to thank the honest and kindhearted girl, Subaru offers to help in her search, and later that night, he even finds the whereabouts of that which she seeks. But unbeknownst to them, a much darker force stalks the pair from the shadows, and just minutes after locating the insignia, Subaru and Satella are brutally murdered. However, Subaru immediately reawakens to a familiar scene—confronted by the same group of thugs, meeting Satella all over again—the enigma deepens as history inexplicably repeats itself. [Written by MAL Rewrite]

Several hundred years in the future, the resources of the Earth runs out, and the progression of the human race has stagnated. The world is now divided into "Units." A boy named Hajiki Sanada lives with his mother and sister in Unit 74, in a place called "Night Town," in which all electricity is shut down at midnight. The key in this story is an object called the GAD. GADs have the ability to reconstruct materials while reacting to feelings of an organic life. The size and shape of the resulting product seem to be different depending on the kinds of feelings that the life possesses. When Hajiki comes in contact with one by accident, it transforms into a huge robot—a Tekkoudo, or "Iron Giant"—which Hajiki names Lightning. And soon he realizes that he isn't the only one with a Tekkoudo, and must find out how to deal with those others who he feels are the "same" as himself. (Source: ANN)