A nineteen-year-old hacker/detective who works for the police. Although he is far-sighted, he only wears his glasses when using the computer, letting them rest on his forehead the rest of the time, because Usui wears glasses as well. He considers himself responsible for his parents' deaths. During the HAL arc, he was infected with the Denshi Drug to become one of HAL's guardians, although the infection was incomplete due to the fact that he was wearing glasses at the time.