In 2136, the first Zerg sighting report appeared.
In 2145, mankind's science and technology developed rapidly through the study of Zerg, and the first individual combat mecha was released.
In 2168, humans destroyed the insect nests and won the first human-insect war. Ushered in more than two hundred years of peace.
In 2385, the era of great peace does not require many weapons. All the mechas left over from the last war have been scrapped, and only the mechas used for performance and sports competitions are still being maintained.
Peace has lasted so long that everyone takes it for granted.
However, a gorgeous meteor shower one day brought new variables.
