X (X/1999) is a gripping apocalyptic fantasy anime based on the manga by CLAMP, set in a dark, modern Tokyo teetering on the brink of destruction. At the center of this intense and emotionally charged story is Kamui Shirou, a powerful psychic who returns to Tokyo after six years to fulfill a destiny he never asked for.

Kamui is fated to choose between two opposing forces that will decide the fate of the world: the Dragons of Heaven, who fight to protect humanity and preserve the Earth, and the Dragons of Earth, who believe that humanity’s destruction is necessary for the planet’s survival. As both sides try to recruit Kamui, he is burdened by tragic memories, unresolved relationships, and the realization that his choice will have irreversible consequences.

Old friendships are rekindled and torn apart, especially with his childhood friends Kotori and Fuma Monou. When Kamui makes his choice, an unexpected twist shifts the balance of power—Fuma awakens as Kamui’s destined "twin star" and becomes his mortal enemy, turning the emotional battle into a personal war of ideals, love, and sacrifice.

X is known for its dark tone, stunning visuals, and philosophical themes. It explores destiny, human nature, sacrifice, and the fragile line between good and evil. The series paints a hauntingly beautiful portrait of a world in chaos, featuring a wide ensemble of psychic warriors, each with their own tragic backstory and emotional stakes.

With its dramatic narrative, supernatural battles, and emotional intensity, X/1999 remains a cult classic that continues to resonate with fans of psychological and apocalyptic anime. It's a harrowing journey of fate versus free will—where saving the world might mean losing everything that matters most.