Gloria, a girl known as the "Crimson Gluttony," was an undefeated fighter.

But one day, she lost her limbs and eyes, and was cast off a cliff into a forest teeming with demonic beasts. Yet, as she clung to life, a sentient ancient weapon appeared before her.

It replaced the parts she had lost and granted her the power to save the world.

However―――――in a situation where there was no need to save the world whatsoever.

This is the story of a girl who knows nothing but battle, and the magical artifact that assists her.