In the future, pollution and radiation caused some animals to grow incompatible with their original physiological structure, but were suitable for fighting. Human experiments at that time became very common, so there would be experimentalists who would take apart corpses and mutant species and sew them back together to become useful biological weapons with strong combat power/that can be produced and stored.
It will be divided into many small units of characters to intersperse the narrative.
Intention: We will have a better future