After the attack by extraterrestrial monster creatures that invaded Earth, the human race gathered and formed a global defense group. Humans raced to develop technology to combat them, such as weaponry, defense systems, and combat vehicles. All humans pledged to hunt them down to the roots. at the main base, numerous battalion troops including infantry, medics, engineers, and others, lined up to hear advice from the world leaders World Leader: Anything worth fighting for requires us to willingly endure suffering to protect it. In battle, it is not our enemy that defeats us, but our own fear. Life is a struggle between fear and bravery. When fear wins, you lose; when bravery wins, you fight to become stronger!!