Stars Are Shining Brightly, I Work as a Cleaner in the Stars

In the dark frontier of the Xinghan Republic, there is a non-existent army. They call themselves "cleaners". Creed is law, darkness is the blade. There is no honor, just an average annual death rate of 37%. There were no reinforcements, just a broken badge with a code name engraved on it. When the law fails in the Broken Star Zone, their creed is the only criterion - plunge into darkness and use darkness to eliminate darkness. Six bases, six silent knives. From the ambush of "Wolf's Lair" to the crushing of "Bakuma", from the shadow of "Snake Hori" to the defense line of "Ryuya". They drive specially equipped mechas and patrol, pursue and make decisions in absolute loneliness. Their battlefield has no flags, only survival and destruction. They are swords eroded by darkness, and also immortal fires in darkness. You have stepped into their defense zone.