Joe Tazuna

A second year at Sonobeno High, and Sara's best friend.

Joe is an extremely upbeat, excitable, considerate, and loyal person. He is easily embarrassed when others misinterpret him and is sensitive to how people perceive his appearance. Like Sara, Joe puts in all his efforts to help the group succeed in the puzzles. He consistently convinces the group to believe in Sara and her abilities and generally places most of his trust to her. Though he is described as gaudy by Reko Yabusame and has a small habit of saying the wrong things at the wrong time, Joe is genuinely kind-hearted and sensitive to others' feelings.

Although not academically one of the smartest in the group, he does provide occasional insights.

Despite his constant optimism and belief in others, Joe is not incapable of suspicion, as he was the first to suggest the presence of a traitor among the participants. Furthermore, while reluctant and torn over what winning the Main Game would mean, he was willing to go through with it, up until Sara exposed his true role.