The
story is told from the perspective of Keiji Kiriya, a new recruit in
the United Defense Force. Despite equipping its soldiers with powered
exoskeletons, the UDF is losing its fight against the mysterious
"Mimics", extraterrestrials which have laid siege to Earth. Keiji is
seemingly killed on his first sortie after killing an unusual-looking
Mimic but, through some inexplicable phenomenon, he wakes and finds that he has
returned to the day before the battle. As this process continues, he finds
himself caught in a time loop as his death and resurrection repeat
time and time again. Keiji's skill as a soldier grows as he passes through each
time loop in a desperate attempt to change his fate.
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