Koji Nagumo

Koji Nagumo (名蜘蛛 コージ, Nagumo Kōji), known as Stringer in the English Dungeon Dice Monsters video game, is a student in Domino High School.

In the manga, Nagumo asks Yugi to play "Monster Fighter" with him while at Domino High School. While playing, Nagumo hits Yugi and takes his gun and monster, Alti. It is revealed that Nagumo is stealing monsters and selling them for ¥30,000 (About $278 US/€179) each. Dark Yugi comes into his store and fights Nagumo and his "Wild Spider" with Katsuya Jonouchi's monster, "Killer Emaada". As the game was a shadow game, Nagumo's face was cracked in the first set, which went to Yugi; the shadow game dictated that the players, instead of the monsters, get damaged in the game. In the second set, Nagumo cheated by kicking Yugi in the side. An enraged Dark Yugi raises the shadow mode to level three. When Nagumo tries to cheat again, his legs are held down by all of the monsters, including his own. Nagumo's soul is purged of the Darkness.

Nagumo makes a brief appearance during the Battle City of the manga and the second series anime as a particpant trying to steal cards from the loser of a Duel he is in. Seto Kaiba appears and says that Nagumo is able to stay if he is able to defeat him. The Duel is not seen; Kaiba unleashes "Obelisk the Tormentor" and defeats him. Another brief appperance was in the movie, where he was a bystander during Joey's Duels at the beginning of the movie.