"Kurozuka" is a dark fantasy anime based on the manga by Baku Yumemakura and Takashi Noguchi. Set in a dystopian future, the narrative spans centuries, blending historical and futuristic elements. The story begins in 12th-century Japan, where Minamoto no Yoshitsune, a disgraced nobleman fleeing his brother Yoritomo, encounters a mysterious woman named Kuromitsu in a remote mountain hut. Kuromitsu reveals herself to be immortal, possessing extraordinary powers and a thirst for blood. After an attack by Yoritomo's forces, Yoshitsune is mortally wounded, and Kuromitsu offers him immortality by turning him into a vampire. He accepts, beginning an eternal existence marked by loss and violence.

Centuries later, the world has transformed into a bleak, post-apocalyptic landscape ruled by a tyrannical regime known as the "Raidenshu." Yoshitsune, now going by the name Kurou, continues to search for Kuromitsu, who has disappeared. The Raidenshu, led by a powerful figure named Rai, seeks to capture Kurou, believing his immortal blood holds the key to their survival. As Kurou navigates this desolate world, he encounters various factions, including rebels fighting against the Raidenshu and other immortals like himself. The narrative explores themes of immortality, love, and the cyclical nature of violence, as Kurou grapples with his eternal life and the consequences of his choices.

The series is driven by its complex characters. Kurou is a stoic, battle-hardened figure burdened by centuries of loneliness and regret. Kuromitsu remains an enigmatic presence, her motivations and true nature shrouded in mystery. Rai, the antagonist, is a ruthless leader driven by a desire for power and control, embodying the oppressive forces Kurou must confront. The interplay between these characters, along with the series' exploration of immortality and human nature, forms the core of the narrative. "Kurozuka" combines action, mystery, and philosophical undertones, creating a story that spans time and delves into the darker aspects of existence.