In the manga, Nagumo asks [[Yugi Muto|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 [[Joey Wheeler|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.