On April 19th, 1973, a race of extra-terrestrial lifeforms launched a landing unit from the moon, which touched down on Earth, in central Asia. Ever since, mankind has been engaged in a losing war against this alien species, known as the BETA, as they have gradually expanded outwards across the globe. After 20 years of non-stop fighting, the war has reached the shores of Japan...
But over half of them never made 
it back from our first sortie.
.لكن أكثر من نصف عددهم لم يعد منذ أوّل مهمّة
Schon beim ersten Einsatz
kam die Hälfte nicht zurück.
Ma metà di loro non sono tornati
dalla prima missione.
Mas mais da metade deles não voltou
da nossa primeira missão.