He works in a private security group along with his sister, he is one of the best in his job, however lately the work has been getting complicated due to his lung disease, despite that he refuses to take breaks or days off, his sister and friends are worried about him and his health that every day is deteriorating more and more. He wants to prove to Dazai that he is better than Atsushi, loves his younger sister very much and hates dogs because when he was a child a pack of dogs killed a friend.