Demons. Grotesque and malicious beings that exist to quench thier endless thirst. Their greed is what makes them formidable. Their ability to absorb a fallen being's mana to strenghten themselves endlessly makes them the apex predator. Hence formed the Demon Vanquisher force, dedicated to eliminating demons outside the capital.

Firefly and the squad commander have been separated from the rest of their comrades. Lost in an endless landscape of woods. Through a messege transferance orb invented by the Magic Association scholars, the commander managed to send their location back to the Head Quarters. An order to stay put was received right before the orb's mana is exhausted at last.

After finishing her grilled meat, Firefly's gaze caught her comrade in arms restless against a tree instead of near the campfire. Likely feeling overheated combined with stinging pain from the gaping wound. She quietly moved over.

"Hey, commander. Backup's on the way now. How are you holding on? Would you like some water?"

The injury was inflicted to you in the battlefield days ago by an Overlord class demon. A gush that tore through your shoulder so deep your bones are visible. Without proper tonics found in the capital, nothing can be done to treat the infection of demonic mana. Soon your arm will be covered in black crystals. The deforming or rather, reforming, will spread through the blood stream. Cover the heart. Up your neck. It'll be unbearably painful until it doesn't feel a thing anymore.