"Revisions" is a science fiction anime series set in the Shibuya district of Tokyo, where a group of high school students is thrust into a perilous situation involving time travel and alternate realities. The protagonist, Daisuke Dojima, has harbored a childhood prophecy that he would protect his friends from impending danger. This belief stems from a traumatic incident in his past when he was saved by a mysterious figure named Milo, who warned him of future threats.

The story begins when Shibuya is suddenly engulfed by a massive spatial distortion, transporting the entire district into a desolate future. The city is attacked by mechanical creatures known as "Revisions," which are controlled by humanoid figures from the future. Daisuke and his friends—Gai, Lu, Marimari, and Keisaku—are rescued by Milo, who reveals that they are now in a timeline where humanity faces extinction. Milo equips the group with advanced combat suits called "String Puppets," enabling them to fight the Revisions.

As the group battles the Revisions, tensions arise among them. Daisuke's overconfidence and single-minded determination to fulfill his prophecy often clash with the more cautious and strategic approaches of his friends. Gai, in particular, questions Daisuke's leadership, leading to internal conflicts. Meanwhile, the true nature of the Revisions and the motives of the future humans, led by a figure named Nicholas, come to light. Nicholas claims that the present-day humans must be eradicated to prevent a catastrophic future, but his methods are ruthless and morally ambiguous.

The narrative explores themes of destiny, free will, and the consequences of altering timelines. Daisuke's unwavering belief in his role as a protector is tested as he grapples with the complexities of the situation and the moral dilemmas posed by the future humans' actions. The series delves into the characters' personal struggles and growth, particularly Daisuke's journey from a self-proclaimed hero to a more nuanced leader who must confront his limitations and the realities of their dire circumstances.

The climax involves a high-stakes battle to reclaim Shibuya and prevent the future humans from erasing their timeline. The resolution hinges on the characters' ability to reconcile their differences and work together, ultimately challenging the notion of predestined roles and highlighting the importance of collective effort in overcoming adversity. "Revisions" combines action-packed sequences with a thought-provoking exploration of time travel and human resilience, offering a compelling narrative within the science fiction genre.