Far in the future, humanity has spread into space, but a sudden spacetime quake severed every network and reset civilization. As people recover, the Transvaal Empire rises at the galaxy's center, and the technology from before the collapse, called Lost Technology, is revered as divine and worshiped by priestesses. On the galactic frontier, an ordinary-looking guard fleet hides an all-female unit, the Angel Corps. They pilot Angel Frames, ships salvaged from Lost Technology, to recover and manage more relics. They are hardly elite pilots: Forte loves weapons, Mint loves costumes, Vanilla barely speaks, Ranpha is flashy and Milfeulle loves to cook. Almost every mission ends in major trouble, played for sci-fi comedy.