In any place, in any universe or world, when a threat emerges from the outside, all inhabitants unite to defend their land. Earth is no exception. By chance or destiny, humans encountered something unusual—an alien. This visit was secretive and hostile, leading to conflict between the two parties, each fighting for their beliefs. Fortunately, humanity managed to eliminate the lone intruder but at a great cost of many lives. Following this encounter, humanity took significant measures, focusing on military preparedness while putting many civilian matters on hold.
At that time, the protagonist was planning to settle down, start a family, and enjoy life. However, he did not anticipate such a monumental event. Lucky for him, this adventure granted him the ability to protect his loved ones and everyone around him. Yet, one person cannot shield an entire planet; many people died, and two-thirds of the land fell under the control of beasts sent by the invading enemy. Although humans lost the first war, they learned much, leading to rapid growth and development, especially in science and technology.
When the right time comes, humans will take the offensive. Despite the significant gap between them and an enemy with the upper hand, humanity is a race that never gives up and will not let anyone take what is theirs.
