Kentarou is a highly competent hacker, and has spent most of his time as a student hacking into different companies and stealing their data, selling it on the black market. He never felt any remorse doing this, as, in his eyes, it was the companies' fault that they didn't pay any attention to their security. After Nagi saved him, he soon fell head over heels in love with her, and started helping her however he could, although Nagi doesn't allow him to participate in any major way, out of fear that he would die or get hurt. Kentarou, however, misinterpreting this as her underestimating his ablitities, always tires to solve incidents on his own, in order to 'prove himself to her'.

He is good friends with Shirou Tanaka, and has been ever since elementary school. Despite his background as a hacker, he is the more outgoing of the two, laughing openly at Sakiko Michimoto, while Shirou tried to stop him. Even so, Kentarou has admitted that Shirou is more reliable than him, and was glad to have him as a friend.

(Source: Boogiepop Wiki)