Muv-Luv Unlimited takes place in an alternate world to Extra, where aliens called BETA (an acronym for "Beings of the Extra Terrestrial origin which is Adversary of human race") have invaded and mankind fights back against the alien aggressors with giant robots called Senjutsuhokousentouki (戦術歩行戦闘機?, Tactical Surface Fighter), usually referred to as simply Senjutsuki (戦術機?), as almost all conventional weapons were ineffective.
The BETA first arrived on Earth in 1973 (in China and Canada) after arriving on the Moon in 1967 and being spotted on Mars in 1958. By 2001, the world population has been reduced to 1 billion people, and most of Europe and central Asia have been wiped out. The Soviet Union, though, is still around, operating out of Alaska. When the BETA first arrived in Japan in 1998, 36 million people were dead within a week.
Most of the major characters from the Extra timeline are present in Unlimited, except for the Unlimited world's Takeru, who is said to be dead, and Sumika, who does not seem to exist in the Unlimited timeline. The characters are, for the most part identical to their Extra counterparts, with the possible exception of Mikoto, who is now female.
In the sequel Muv-Luv Alternative, Takeru wakes up three years after the end of Unlimited to find himself back in his room. Although he first thinks that everything that had happened to him was a dream, he soon feels that something is wrong, and leaves the house to find that he has been sent back in time to the beginning of the events in Unlimited. Unwilling to accept the events at the end of Unlimited, he decides to help professor Kouzuki save the earth and mankind.
This is not my original story but i want to introduce Muv-Luv for every people here. Every script is belong to AGE copyright