Knowing that he is risking his life, Kei Kurono makes the uncharacteristic decision to jump onto train tracks to save a homeless man from death, only to perish in the process. But when he comes to, Kei finds himself in a room with several other recently deceased people, as well as a large, mysterious black ball. While the people in the room are trying to make sense of their situation, the ball suddenly opens, revealing a cache of weapons and strange black suits. The ball then instructs everyone that they have to hunt down an alien and teleports them to an unknown location. With very little information to work off of, Kei teams up with his childhood friend Masaru Katou and an unfamiliar woman, and the trio explore their new surroundings. It quickly becomes apparent, however, that they have stumbled into a dark and dangerous world where anything could happen to them.

The flames of war explode in the Middle East as two shadow forces unleash monstrous new weapons of mass destruction! But in a world in which giant robots are real, the most dangerous weapon of all lies buried within a human mind. Yuushirou, the fourth son of the mysterious and powerful Gouwa family, finds himself at the center of events that will change the future of mankind forever! Nothing can prepare the human race for what is about to be unleashed in Gasaraki! (Source: Sunrise)

Thirty-two years have passed since the initial defeat of the Invaders. A.E.G.I.S is all but dismantled now and has become an underground organization consisting of only a few Gate Keepers left to save humanity. One of the members, Ayane Isuzu, is sick of society as a whole, though she continues to defeat the Invaders out of spite for her father. Suddenly, she learns of the revival of Machine General (Kikai Shogun) and Devil Count (Akuma Hakushaku), but a mysterious ghost girl now accompanies them. It is up to Ayane and the remnants of A.E.G.I.S to stop them and save humanity once again. (Source: ANN)

Akari Taiyou is an apprentice fortune teller living with her aunt, uncle, and their daughter Fuyuna. Having lost her mother at a young age, the only thing Akari has left of her is a deck of tarot cards and a dream to follow in her footsteps as a fortune teller. One night, Akari has a dream of being attacked by a plant monster and witnesses a stronger version of herself defeat it. When she awakens, she discovers to her horror that the monster was actually Fuyuna. But mysteriously, Akari and her relatives soon forget Fuyuna ever existed. After another close encounter with a similar monster, she is rescued by three magical girls: Ginka Shirokane, Seira Hoshikawa, and Luna Tsukuyomi. They explain that they are from the Sefiro Fiore organization, which uses Elemental Tarot power to fight the evil creatures known as Daemonia. Akari discovers she too is a magical girl and has inherited her mother's power of The Sun card. However, she comes to realize Daemonia are actually people who have been possessed, and she must decide whether to try to save what is left of their humanity or to wipe them from existence. As Akari comes to terms with her grim duty of protecting the world from Daemonia, the bonds of the organization and that of their team will soon be strained when they deal with grave threats from the outside and from within.