"Code:Breaker" is a manga series written and illustrated by Akimine Kamijyo. The narrative centers around Sakura Sakurakouji, a high school student with a strong sense of justice, who encounters a mysterious transfer student, Rei Ogami. Rei is revealed to be a "Code:Breaker," an individual with supernatural abilities tasked with eliminating those who evade conventional justice. These Code:Breakers operate under a secretive organization and are granted powers by the government to carry out their missions, often involving lethal force.

Sakura initially opposes Rei's methods, as she believes in non-lethal justice and protecting the innocent. However, she becomes entangled in the world of Code:Breakers after witnessing Rei's abilities firsthand. Rei possesses the power to manipulate blue flames, which he uses to incinerate his targets. As the story progresses, Sakura learns about the existence of other Code:Breakers, each with unique powers and motivations. These include Heike, who controls electricity; Toki, who manipulates time; and Yukihina, who wields ice-based abilities. Together, they form a team under the leadership of Hitomi, a high-ranking operative within the organization.

The plot delves into the origins of the Code:Breakers and their connection to a mysterious substance known as "Adam's Seed," which grants them their powers. The series explores themes of morality, justice, and the consequences of wielding immense power. Rei's past is gradually revealed, uncovering his tragic upbringing and the reasons behind his cold demeanor. Sakura's unwavering idealism serves as a counterbalance to Rei's pragmatic approach, creating a dynamic interplay between the two characters.

As the story unfolds, the Code:Breakers face various adversaries, including rogue individuals who misuse their powers and a shadowy group known as "Eden," which seeks to exploit Adam's Seed for its own agenda. The conflict escalates as the true nature of Adam's Seed and its connection to the Code:Breakers' abilities is unveiled. The series builds toward a climactic confrontation between the Code:Breakers and Eden, with the fate of humanity hanging in the balance.

Throughout the narrative, the relationships between the characters evolve, particularly the bond between Rei and Sakura. Their interactions highlight the tension between justice and vengeance, as well as the potential for redemption. The series combines action, supernatural elements, and moral dilemmas, creating a compelling and multifaceted story.