Phantom Soul Sword: Lambda Neros R

The protagonist Rimua hears a mysterious voice while on a guild mission. Drawn by the voice, she ventures into a cave and discovers a single sword. When she picks up the sword, a soul calling itself "Nero" appears! Rampaging monsters, shadows lurking in the royal capital, the truth behind the Hollow Soul Sword. And an evil presence that threatens the world… Rimua is swept into the vortex of battle over the Hollow Soul Sword―――