Kenichi Harakawa, who is almost always called by his nickname Haraken, is a central character in the series. He is a boy of elementary school age who serves as the president of the Biology Club at his school. His reserved and thoughtful nature makes him the polar opposite of the more outgoing and impulsive Fumie, and he becomes the fifth member of the Coil Cyber Detective Agency.

Haraken is defined by a quiet and introverted personality. He is portrayed as shy, secretive, and often keeps to himself, holding a deep personal connection to mysteries that others do not fully understand. This reserved exterior masks a profound internal drive. His primary motivation stems from a tragic event in his past: the death of his childhood friend, Kanna Ashihara, who died in a traffic accident under mysterious circumstances the year before the story begins. Haraken is personally invested in researching internet viruses and the strange, illegal entities known as illegals. He secretly torments himself with the idea that a part of Kanna might still exist somewhere on the other side, a hidden layer of cyber-reality accessible through the digital glasses everyone uses. This quest to understand the nature of illegals and the digital world is directly tied to his unresolved feelings for Kanna.

Within the story, Haraken acts as a bridge between the ordinary world of the children and the deeper, more dangerous aspects of the digital metropolis of Daikoku City. His expertise and focused research are invaluable to the detective agency, even as his personal quest sometimes puts him at odds with others or draws him into risky situations. A key relationship is with his aunt, Tamako, who is deeply worried about his health and well-being, primarily because of the instability that comes from his heavy and relentless usage of his computerized glasses. As the series progresses, Haraken also begins to develop feelings for the protagonist, Yasako, though this is often overshadowed and complicated by his lingering fixation on the incident with Kanna. His development involves slowly confronting the past and learning to balance his grief with the possibility of new connections in the present.

In terms of abilities, Haraken possesses a high level of skill as a hacker and researcher within the augmented reality world. His knowledge of the underlying structure of the digital space, particularly concerning viruses and illegals, is advanced for his age. He wears gray hair and gray eyes, and is commonly seen with his digital glasses, which are essential tools for interacting with the cyber-world that pervades his daily life.