It's a long story. In 5028 AD, an unknown organism appeared on the star GT-874. After investigation, it was found that the organism had a low IQ, but it could travel freely through the universe, do whatever it wanted, and hunt for food: humans.
Humans called them ghosts, organized a fleet and a general headquarters, used chips to implant into human brains, and created human robots (human weapons). About why humans should be used: high sensitivity, wide distribution, easy to control, and low price.
The Qiyun Ship is the largest warship in the headquarters. The relationship between the captain Fu Yunyi (yes, Shou La) and his human weapon C-927 is extremely subtle.
Regarding chips, different levels of A1-A8 chips will be selected during this year of human beings to determine which chip he or she should be equipped with. The chip changes the human body's tissue structure, strength, agility, vision, memory, and will not age. Once the chip is removed, death has come.
Usually the commander-in-chief and deputy commander-in-chief of the general headquarters are equipped with A8 chips (A8 can control chip equipped users below A6. They are different from weapons, have self-thinking, and have extremely strong armed capabilities and fighting skills). The captains and deputy captains also have A8 chips. The military commanders in the fleet are A7 (the difference between A7 and A8 is the fighting skills, there is no other big difference)
Brainless robots A1 and A2
The most common weapon, A3, is equivalent to an armed robot that obeys commands and has no emotions or self-thinking.
A4 rarely appears, no need to explain too much
A5, A6, make up the numbers
Purpose: Peace, and beautiful love