Otherworldly Evil Sword

"In a realm where the art of the sword reigns supreme, weapons wield the power to cleave mountains and vanquish thousands of people. In this world, strength is garnered through the blade, and killing becomes the path to unparalleled power. Amidst this brutal reality, a young teenager named Yami experiences a life-altering tragedy. While dining with his family, a formidable swordsman invades, ruthlessly exterminating every swordsman and their kin. Miraculously, Yami is spared, but the devastating sight of his slain family leaves him in a state of profound shock.

Years pass, and Yami emerges transformed, embodying the very essence of the killer he once despised. Yet, his path of destruction bears a purpose. Haunted by the massacre of his family, Yami now wields his sword with a dark resolve: to extinguish the endless cycle of bloodshed that plagues his world, even if it demands the lives of every swordsman in existence.

In the midst of his vengeful crusade, Yami stumbles upon a mystical sword unlike any other. This sentient blade speaks to him, offering a tantalizing proposition: "Surrender your life to me, and I shall grant you the power to realize your dream."