"Dead Girls" is a dark fantasy anime series that explores themes of mortality, identity, and the supernatural. The narrative centers around a group of young women who find themselves trapped in a mysterious, otherworldly realm after their untimely deaths. Each character retains fragmented memories of their past lives, but their identities and the circumstances of their deaths remain shrouded in uncertainty. The setting is a surreal, decaying cityscape filled with eerie landscapes and ominous structures, which serves as both a prison and a testing ground for the protagonists.

The main characters include Rei, a stoic and pragmatic girl who becomes the de facto leader of the group; Aya, a cheerful yet enigmatic figure who hides a deeper connection to the realm; and Yuki, a reserved and introspective individual grappling with guilt over her past. As the group navigates the hostile environment, they encounter grotesque entities and supernatural phenomena that challenge their resolve and force them to confront their fears. The series delves into their personal struggles, revealing fragments of their lives through flashbacks and cryptic visions.

A recurring motif is the concept of "redemption," as the characters are given cryptic tasks by a mysterious overseer known only as the Gatekeeper. These tasks often involve confronting their past mistakes or unresolved emotions, with the promise of a second chance at life as a reward. However, the rules of the realm are ambiguous, and the consequences of failure are dire, leading to tension and moral dilemmas among the group. The narrative builds toward a climactic revelation about the true nature of the realm and the Gatekeeper's intentions, culminating in a resolution that leaves the characters' fates open to interpretation.

The series blends psychological drama with supernatural horror, using its atmospheric setting and character-driven storytelling to explore themes of loss, regret, and the search for meaning in the face of death. The interplay between the characters' personal journeys and the overarching mystery of the realm creates a compelling narrative that balances emotional depth with suspenseful intrigue.