"Script Downers" is a manga series that explores the intersection of technology, identity, and human connection in a near-future setting. The story is set in a world where advanced AI-driven software, known as "Scripts," can alter or suppress human emotions and memories. These Scripts are widely used by individuals seeking to cope with trauma, enhance productivity, or escape emotional pain. However, the widespread adoption of this technology has led to societal shifts, with people increasingly relying on Scripts to navigate their lives.

The protagonist, Aoi Tachibana, is a young programmer who works for a company developing Scripts. Aoi is deeply skilled but harbors a personal conflict: her younger sister, Yui, became addicted to Scripts and ultimately disappeared after overusing the technology. Driven by guilt and a desire to uncover the truth, Aoi begins investigating the darker side of Scripts, including their potential to manipulate and control users. Her journey leads her to uncover a clandestine network of individuals known as "Downers," who have rejected Scripts and live off-grid to preserve their unaltered emotions and memories.

As Aoi delves deeper, she encounters Kaito, a former Script developer turned Downer, who becomes her reluctant ally. Kaito possesses extensive knowledge about the flaws and dangers of Scripts, having once been a key figure in their creation. Together, they uncover a conspiracy involving corporate entities exploiting Scripts to exert control over society. The narrative examines themes of autonomy, the ethical implications of emotional manipulation, and the consequences of technological dependency.

The story is structured around Aoi's dual mission: to find her sister and to expose the truth about Scripts. Along the way, she faces moral dilemmas, confronts her own reliance on technology, and grapples with the question of what it means to truly feel and remember. The series balances its speculative elements with intimate character development, particularly through Aoi's evolving relationships with Kaito and other Downers. The plot is driven by a mix of suspense, action, and emotional depth, culminating in a confrontation that challenges the societal norms surrounding Scripts and their use.