Streaming: Crunchyroll
Episodes: 12
Source: Game Series
Episode Summary: In 1973, aliens launched an offensive from the moon. The BETA as they came to be called, have since slowly spread out across the planet, killing humans and erecting hives in their wake in order to facilitate more destruction. Military units across the world have done what they can to try to hold back the BETA forces, but the aliens’ strength seems only to increase and the human population continues to diminish. The Western half of Japan has slowly been taken over by BETA, and in 1998 they are now in danger of taking over the rest of the country.
An evacuation order has already been issued as the Japanese military begins to detect movement at the bottom of the ocean near the city of Sadogashima. Because of their loss of life, they’re forced to use rookie pilots to man the Tactical Surface Fighters – mechanical armor that allows close-combat. Unfortunately, despite the passion of the soldiers, the sheer number of BETA, including several fortress-class entities with the power to break down the giant walls protecting the people inside, overwhelm them and they’re forced to evacuate. Sadogashima becomes the site of the 21st BETA hive.