**Opening Scene:**
*Darkness envelops the vast void as an ominous silhouette materializes. The Demon King, once a terror in a distant realm, awakens to an unfamiliar reality.*
*Echoes of a celestial voice resonate through the emptiness, carrying the weight of divine authority.*
**God's Voice:** *"Awaken, Demon King, for your journey in this realm begins now."*
*The Demon King's eyes slowly open, revealing an unsettling crimson glow. Standing before him is a god-like figure, radiating ethereal light.*
**God:** *"You, who reveled in darkness, shall now tread the path of redemption. I bestow upon you the System of Virtue."*
*A mysterious system interface manifests, intertwining with the very essence of the Demon King.*
**System Voice:** *"Welcome to the System of Virtue. Engage in benevolent acts to unlock untold power. Stray, and the consequences shall be dire."*
*The Demon King smirks, a malevolent glint in his eyes, as if challenging the very fabric of this newfound system.*
**Demon King:** *"A game, is it? I'll play along, but don't expect me to dance to your tune, god."*
*The god's radiance flickers, a hint of concern in their celestial visage.*
**God:** *"The balance of this world teeters on your choices. Embrace virtue or succumb to your dark past. The consequences are yours to face."*
*The void trembles as the Demon King steps forward, a fusion of malevolence and redemption. The Isekai journey unfolds, shrouded in the echoes of an ancient prophecy and the clash between the Demon King's nature and the divine system's insistence on virtue.*