The main protagonist of Gohou Drug, Kazahaya, above all else, does not want to die. This fear seems linked to a girl from his past named Kei, who is strongly hinted to be his twin sister. In his thoughts, Kazahaya reveals that he and Kei lived an isolated life, confined to a single property where no other children resided, and neither completed elementary school.
At the beginning of the series, Kazahaya is discovered lying in the snow, having fled his former home and nearly freezing to death. He is rescued by Rikuo, who brings him back to the Green Drugstore. Since then, Kazahaya has been determined to earn money so he can live independently, which motivates him to accept the 'extra' jobs offered by Kakei. His supernatural ability allows him to see the "memories" of objects or people when he touches them. Additionally, he might possess empathic abilities, as he can absorb emotions and memories, and has even experienced another person's (Rikuo's) visual perspective.
Although Kazahaya may sometimes appear helpless or naively innocent, he possesses many skills and abilities that make him highly capable in certain tasks. His behaviors and abilities often resemble those of a cat, including a heightened sense of smell and vision, remarkable agility and speed, and a tendency to look like an angry kitten when upset.
Kazahaya is noted to be 17 years old at the start of the series. He is smaller, slimmer, and has a more feminine appearance than Rikuo, making him appear quite "pretty." He is easily emotional and frequently falls for Rikuo's teasing due to his quick temper.
