Around 2500 AD.
The development of science has given birth to a humanoid artificial life named "Methocera". Among them are special species with probability of one for many millions of those who can transcend humanity.

The five superpowers live in peace and settle all their problems with space duels of such "Methocera irregulars" in exoskeleton suits "A2". Every superpower hunts for talented warriors. This is a story about beautiful girls who are destined to keep fighting.

[From vndbreview]