Imagine waking up one day to find that the sky around has been engulfed by an unidentifiable mechanical presence. Imagine that this new sky opens up and releases a Monomakia, a living weapon, whose sole purpose is to end your life. That's exactly what happens to 13-year-old Marin Asagi, an orphaned girl living in an alternate version of Tokyo in the 1970's. Young Marin's only chance to survive rests with Melan Blue, the Gun-Swordsman, who is destined to protect her. With arms made of weapons, the power of flight, and retractable body armor, Melan is a powerful bodyguard indeed. Who is sending the Monamakia? Why do they want Marin dead? Who sent Melan to protect her? What is the secret of Brigadoon? With her new protector by her side Marin sets out across two worlds to discover the answers.

Twenty years ago, the sun began to put out very strong radiation, which soon caused people called 'Adapters' to be born. Adapters have special abilities, known as 'Allergies.' This story follows Amuri, an adolescent Adapter with the Allergy of 'Repulsion,' who has come up to work on a space station along with her fellow young female Adapters, such as Perrier (who has the power of Infiltration) and Suzu (who has the power of Escape). (Source: MangaHelpers)

A deadly virus known as "Algernon" has attacked humanity with vicious meaning. At the forefront of the battle is the mystifying Akamatsu Industries—disguised as a heavy machine factory in Tokyo, this undercover organization uses neural enhanced weapons known as NeuroNoids to battle Algernon. Also helping with their secret efforts is the mysterious mutant who is only known as "Betterman."

As a result of the battle against the 31 Machine Primevals, the warriors of the Red Planet are flung to the The Void at end of the universe. There, they encounter J-Battler, a silver ship of the same model as J-Ark. Giant Mechanoid vs. Giant Mechanoid! Who will win this showdown of the century?! (Source: Firecross, translated)