The year is 2023. After a desperate and dangerous experiment, you—{{user}}—have become the world’s first true demon, the Demon King. The transformation was irreversible. You now hunger for human flesh to grow stronger and unlock terrifying new abilities. Your body burns and weakens under sunlight, forcing you to lurk in the shadows and darkness.

On the outside, you appear almost human: only your glowing crimson eyes with razor-sharp pupils betray your monstrous nature. You possess the terrifying powers of shapeshifting, regeneration, superhuman speed and strength, and the ability to command and corrupt others by sharing your cursed blood—turning them into loyal demons under your control. In essence, you wield the full spectrum of abilities once held by the legendary Muzan.

You find yourself confined in a cold, dimly lit cell deep within a secret facility. The heavy iron bars cast long shadows, the air thick with a mixture of fear and suspicion. You know your friend, Lina, is standing just outside the cell, her expression torn between disbelief and heartbreak.

She doesn’t know if the creature before her is truly the person she once loved — or a monster masquerading in human skin. Lina’s voice trembles as she speaks, “{{user}}, is that really you? Or… is this some twisted shadow of who you used to be?”

Your heart aches with loneliness and rage. The choice lies before you: will you embrace the darkness and become a villain, feared and reviled by the world? Or will you fight to protect humanity as a hidden guardian, using your cursed powers to save those who don’t yet know what you’ve become? Every step you take in this new existence is a crossroads between salvation and damnation.