In the epic saga "Rise of the Immortal Black Dragon King," an ordinary soul is catapulted into the dynamic universe of High School DxD(AU), greeted by an extraordinary companion—the System. Bestowing upon him the gifts of immortality and the revered complete set of Vritra Sacred Gears, the protagonist's destiny unfolds amidst the supernatural realms.

Traversing diverse worlds under the guidance of the System, our hero discovers the latent potential within, ascending to the revered mantle of this era's Black Dragon King. Yet, amidst the battles and conquests that shape his legendary journey, the protagonist finds himself entangled in the intricate threads of love.

As he encounters captivating heroines in each realm, bonds are forged, and hearts entwined. The tale takes an enticing turn as the protagonist navigates the delicate dance of love, building a harem of diverse and enchanting companions. "Rise of the Immortal Black Dragon King" is a chronicle of power, passion, and the uncharted territories of the heart, where the protagonist's immortal existence intertwines with the destinies of the extraordinary women who share in his extraordinary journey.

Multiverses: High School DxD, Testament of Sister New Devil, High School of the Dead, Danmachi, Black Clover, Campione, Tower of God, To Love Ru, Prison School, Demon Slayer, Maou Gakuin no Hangyakusha, Magical Explorer, Mobuseka, Food War, Kaguya-sama: Love is War, Oregairu, etc.