Koji Nagumo (manga)

Koji "the Spider" Nagumo is a character in the Yu-Gi-Oh! manga. He is a student and gamer in Domino High School.

Monster Fighter
Nagumo initially presents himself as a gamer, asking Yugi Mutou to play Monster Fighter with him while at Domino High School. While playing, Nagumo reveals that he has a "house rule" that he "forgot" to tell Yugi about; that the loser surrenders their gun and figure to the winner. He then tells Yugi, who is already shocked by this, hits Yugi and takes his gun and monster, Alti.

Later, it is shown that Nagumo's real goal is to take advantage of the "Monster Fighter" craze to make money, selling Yugi's "Alti" and other Monster Fighter figures and guns he's stolen at inflated prices to other students (¥30,000 each, or about $300 US at the time). Whenever he runs out of stock, he engages other students using his "house rule" to rebuild his inventory. Dark Yugi comes into his store and challenges Nagumo and his Wild Spider to a match with Katsuya Jonouchi's monster, Killer Emaada. At the start, Yugi warns Nagumo that their the game will be a Shadow Game. The first round is settled when Nagumo distracts himself planning to punch Yugi, allowing Yugi to knock out Wild Spider. As a result of the game's condition that the players take damage instead of their monsters, Nagumo's face was cracked by the punch. In the second set, Nagumo cheats by kicking Yugi in the side, allowing Wild Spider to land three intense blows to Killer Emaada torso for the win. Enraged, Dark Yugi intensifies his game, raising the "shadow mode" to level three. When Nagumo tries to cheat again in the third set, he finds his leg unable to move. As result of the intensified shadow game, his legs are held down by all of his stolen monsters– plus his now AWOL Wild Spider. Nagumo saw, to his horror, that the monster on his field was not "Wild Spider," but a twisted caricature of his soul, composed of Wild Spider's body with his own face and arms. Yugi then dealt the killing blow, piercing the representation of Nagumo's soul, purging it of the darkness while the real Nagumo is K.O.'ed.

Battle City
After defeating a duelist, Nagumo is unhappy with the card he's won through the ante rule and demands that the loser give something of equal value to his card, "Hyozanryu" or else ¥100,000 (about $900 US at the time).

However, Mokuba appears and calls a foul for changing the ante and wagering money. Koji insults Mokuba, but then Seto Kaiba appears and tells Koji off, saying that when he speaks rudely to Mokuba, he dishonors Kaiba and the Battle City tournament. Kaiba tears up the "Hyozanryu" card, saying Koji was going to lose it anyway. He challenges him to a Duel, anteing a briefcase of rare cards and "The God of the Obelisk". He allows Koji to use the cards from the briefcase in the Duel, to compensate for "Hyozanryu", but says he will take them after he beats Koji. Koji, overconfident at his newly empowered deck, suffered a devastating defeat as Kaiba unleashed "Obelisk", and takes his Puzzle Cards. Koji is left traumatized by Obelisk's overwhelming power, and ended up screaming in terror as he relived the image of the God crushing him.

Gaming items
For Monster Fighter, Koji used the monster "Wild Spider". He also had a number of stolen fighters, which he sold.

The only card seen in Koji's Duel Monsters Deck was unnamed.