"A Dark Rabbit Has Seven Lives" is a fantasy romance series centered around Taito Kurogane, a high school student who discovers he is the reincarnation of a powerful warrior from another world. Taito’s life takes a dramatic turn when he encounters the mysterious and beautiful Kuze, a girl who claims to be his fiancée from a past life. Kuze reveals that Taito is part of a lineage of warriors known as the "Seven Lives," individuals who possess immense power and are destined to protect their world from dark forces.

The narrative unfolds as Taito learns about his past life and the responsibilities tied to his reincarnation. He is drawn into a conflict involving the "Dark Rabbit," a malevolent entity that threatens both his world and the alternate realm from which Kuze originates. As Taito begins to unlock his latent abilities, he must confront various adversaries, including other reincarnated warriors and supernatural beings, all while grappling with the complexities of his relationship with Kuze.

Kuze, a key character, is deeply connected to Taito’s past and serves as both a guide and a source of emotional conflict. Her presence forces Taito to reconcile his current identity with the memories and emotions of his former self. The series explores themes of destiny, identity, and the enduring nature of love across lifetimes, as Taito and Kuze navigate their intertwined fates.

Supporting characters include Gekka, a stoic and loyal ally who aids Taito in his battles, and various antagonists who seek to exploit the power of the Seven Lives for their own purposes. The story blends action, romance, and supernatural elements, with a focus on Taito’s growth as he embraces his dual identity and fights to protect those he cares about. The narrative builds toward a climactic confrontation with the Dark Rabbit, testing Taito’s resolve and the strength of his bonds with Kuze and his allies.