The second part, "Muv-Luv Unlimited", starts with Takeru Shirogane waking up in his bed, reminiscent of the start of "Muv-Luv Extra"; however, Takeru quickly realizes that neither Meiya nor Sumika come to wake him that morning. Upon leaving his house, he finds his neighborhood destroyed and Sumika's house crushed under the wreckage of a large mecha. Takeru later learns that he is in an alternate world to "Extra", where aliens called BETA (an acronym for "Beings of Extra Terrestrial origin which are Adversary of the human race") have invaded and mankind fights back against the alien aggressors with mecha called , usually referred to in Japanese as simply .