In "Bleach Movie 3: Fade to Black," the narrative centers on Rukia Kuchiki, a Soul Reaper from the Gotei 13, who mysteriously disappears from the memories of her comrades in the Soul Society. The story begins with an unexplained explosion in the Seireitei, the Soul Society's central hub, which triggers a series of events leading to Rukia's erasure from the memories of her friends, including Ichigo Kurosaki, Orihime Inoue, and Uryū Ishida. As a result, Rukia is left isolated and confused, unable to comprehend why her allies no longer recognize her.

The cause of this phenomenon is traced to a mysterious figure named Senna, who is revealed to be a manifestation of Rukia's lost memories. Senna's existence is tied to a powerful artifact known as the "Memory Rosary," which has the ability to manipulate memories. The antagonist, a rogue Soul Reaper named Kōga, seeks to exploit Senna and the Memory Rosary to exact revenge on the Soul Society for his past grievances. Kōga's actions not only threaten Rukia's existence but also destabilize the balance between the human world and the Soul Society.

Ichigo, despite having no memory of Rukia, senses a deep connection to her and embarks on a mission to uncover the truth. Alongside his friends, he confronts Kōga and battles through the Soul Society's defenses, which have been manipulated to perceive him as an enemy. As the conflict escalates, Ichigo and Rukia work together to confront Kōga and restore the lost memories. The climax involves a high-stakes battle where Ichigo's resolve and Rukia's determination are put to the test, ultimately leading to the resolution of the memory crisis and the restoration of their bond.

The film explores themes of identity, memory, and the enduring strength of relationships, while maintaining the action-packed and emotionally charged tone characteristic of the "Bleach" series. Key characters such as Ichigo, Rukia, and Senna drive the narrative, with their interactions and growth forming the core of the story. The plot is tightly woven, blending mystery, action, and emotional depth to create a compelling addition to the "Bleach" franchise.