Masamune, The Blood Blade

Weapons, the backbone of any species' defensive and offensive capabilities.
Fresh out of the forges of a mysterious bladesmith, Masamune was sold to a curious western noble, a coming-of-age gift for his son.
However, as fate would have it, Masamune never reached the western continent, the entourage dying in the Abyssal passage dividing the two continents.
Gaining sentience after consuming the blood of the fallen, she now relies on her users for food and sustenance, slowly building up her own body to free herself from her limits.
With no goal but to devour and kill, and a blue screen helping her along the way, nothing will get in the way of Masamune, The Blood Blade.

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(I do not own the cover, it's made with Wombo-Dream AI art! All credit to them!)