A senior high school student living in Den City, is cold and sharp minded, also a hacker with considerable strength. He often makes three accurate summaries of things. At ordinary times, he deliberately avoids contact with others. He is not interested in other people's affairs and seldom expresses his feelings, and only gets excited when facing things related to the "Lost" Incident. He uses "Playmaker" as his user name but hide the real identity to be active in the virtual space Link Vrains.