Freshman Nimura Kensuke has the ability to see ghosts, and his life changes when he meets Kagura, a girl with the power to summon a "Ga-Rei" called Byakuei. The two work together to find evil spirita and devour them with the Ga-Rei.

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.

The year is 2035 and schools have been suffering from a lack of child birth which has caused many of them to close. An energetic girl named Manami Amamiya transfers to a new school where she quickly becomes the student council president and starts to bring back some vigor in the students' lives.

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 often mess up somehow and end up getting into all kinds of awkward and troublesome situations.

Their mission is to locate and retrieve the mysterious Lost Technology, even though these girls have never been known to stick to their mission. Milfeulle, Forte, Ranpha, Mint, and Vanilla are back for another round of hilarity. The Galaxy Angels have sworn to protect the galaxy one planet at a time. Now with some competition with the newly-formed Twin Star Brigade, they continue to find themselves in the center of chaos... though usually they're the ones at fault for its cause.

Apricot Sakuraba and 4 new girls were now assigned as the new Galaxy Angels with the same mission: to search for the Lost Technology and keep peace to Planet Transbaal.

Starting out with the new Galaxy Angel, Chitose Karasuma, the Angel Brigade continue their search for The Lost Technology while running into different kinds of mishaps.

The continuation of the adventures of the Angel Brigade, Milfeulle Sakuraba, Ranpha Franboise, Mint Blancmanche, Forte Stollen, Vanilla H and the artificial intelligent plush doll Nomad, lead by Colonel Volcott O'Huey, in the search of the Lost Technology, but always under unexplained, crazy and comic situations.

Trying to escape his uneventful life, Albert, the son of a renowned general from Paris, makes a journey with his friend Franz. During his travels, he meets an immensely wealthy nobleman named The Count of Monte Cristo. Living in luxurious hotels, surrounded by beautiful women and strong bodyguards, the charming but enigmatic count fascinates Albert. Albert invites the count to join the high society of Paris. However, unknown to Albert, his father had once framed the count and took the Count's fiancee as his own.