Star Ring Remnant Fleet

By 2187 AD, humanity could travel freely throughout the solar system. In the asteroid belt lived an alien species called the Thorn-Nest Worms, which devoured metal, parasitized spaceships, and laid eggs on abandoned space stations. After the regular military collapsed, humanity had only one ragtag squad registered at a frontier free port: the Star Ring Garrison. Five bankrupt craftsmen, five self-assembled scrap mechs, no official roster, no military funding, with parts that could only be scavenged, repaired, or stolen. At first they only wanted to take nest-clearing and escort jobs to make a living, but then during one salvage operation, from a derelict ship rusted for decades, they found a set of coordinates that should not exist. Those coordinates marked the location of the Thorn-Nest Worms' relay nest. In the entire solar system, only they knew where it was. Some wanted them silenced, some wanted them dead, and others wanted to trade the coordinates for money. Five paupers gradually became the only people in the world who knew the truth. They did not want to be heroes. But when the whole world could not be relied on, the ones who could shoulder a scrap mech and block a swarm of worms were these few people. — Description from novelcodex.org