Yu - Gi - Oh ! - Duel 043 " Monster Fight ! ! ( Part 1 ) " is the forty - third chapter of the " Yu - Gi - Oh ! " manga . This chapter was originally printed in the " Weekly Shōnen Jump " magazine in Japanese . Its first English release was in the " Shonen Jump " magazine . It has been reprinted in volume 6 of the tankōbon and volume 4 of the bunkoban . Summary . Kame Game . At Kame Game , Sugoroku Mutou hands Katsuya Jonouchi a gun - shaped toy , saying here is a game he might like , " Monster Fighter " . Yugi explains that it is like a combination of a monster boxing game and arm wrestling . Jonouchi says that it sounds neat and Yugi agrees , thinking that it is going to be " hot " . Yugi goes on to explain how to setup the game ; first the player picks a monster that they are going to use . There are over a hundred kinds of monsters ; Each with their own moves and hit strength . Jonouchi chooses a monster , " Killer Emaada " . Yugi continues to explain the rules ; Once the monster has been chosen , the player places it on the special " Fighting Gun " . The monster is connected to the base with a remote control wire . Then the two players link their guns to battle . Yugi has chosen the monster , " Alti " , who he claims is very strong . Before they can begin , they must input their move data . This is done by inserting a small barcode disk into a sensor on the back of the gun . The sensor scans the disk and reads its secret moves . Each monster has different finishing moves , Yugi adds . Yugi explains how to battle ; Once the game begins players are to watch their opponent for an opening and use the punch , kick and guard buttons to defeat him . A diagram shows where the punch , kick , guard and finishing move buttons are on the gun . There are two ways to win ; Knock the enemy out by hitting their weak points or force them out of the arena with a critical hit . Yugi and Jonouchi decide to battle with their monsters . After much punching , blocking and kicking , Jonouchi leaves " Killer Emaada ' s " weak point open and Yugi has " Alti " kick it . The hit causes the handle of Jonouchi ' s gun to vibrate . Sugoroku explains that when a player ' s weak point is hit , they cannot move for two seconds and he prompts Yugi to take this opportunity to use his finishing move . Yugi pulls the trigger on his gun and " Alti " uses its " Mach Tornado Punch " attack , knocking " Killer Emaada " off the platform . Yugi celebrates and Jonouchi asks if he ever loses at anything . Sugoroku asks for Jonouchi ' s opinion on the give . Jonouchi replies that it is awesome and he loves it . Jonouchi then suggests that he and Yugi show it to everyone at school . Domino High . Classroom . The next day at school , during a break , Yugi faces Jonouchi in another game of Monster Fighter . Yugi ' s " Alti " gets a critical hit on Jonouchi ' s " Killer Emmada " , knocking it out of the arena . A group of students flock around them and ask what game this is and decide that they want one too . Within one week , Monster Fighter became a big hit at school . During lunch break and recess battles were being held everywhere . At school , Jonouchi admits that he did not think Monster Fighter would be this popular . Yugi says that they are still sold out at his store and it is like that everywhere else too . Although Sugoroku was happy because it meant the store got a lot of money , Yugi feels it is almost like it was too big a hit . Some students comes over and ask Yugi if his place is still sold out . He replies that they are and he does not know when they will be getting some more . After they leave , Yugi tells Jonouchi that that is the hundredth time he has been asked today . A boy with blonde hair and a black sleeveless top , featuring a spider design arrives at classroom 1 - B and asks if there is a " dude called Yugi " in this class . Someone points Yugi to the visitor , but warns him that that is Koji " the Spider " Nagumo , someone who is good at games , but is said to steal people ' s things . Roof . Yugi goes up to the roof with Koji . Yugi says that if this is about Monster Fighter , his store is still sold out . Koji says that he is aware and does not go to the store . He holds up a Fighting Gun and Yugi realizes that he already has one . Koji explains that he brought Yugi up here because he knew Yugi would have a Monster Fighter and asks if he brought it with him . Yugi holds his up and slowly says " yes " . Koji suggests they have a battle . He claims to be a gamer like Yugi and the one who made Monster Fighter popular . Yugi happily agrees , seeing that Koji was just looking for someone to play with . Yugi uses " Alti " again for their game . Koji calls it a nice scapegoat for a weakling . Koji ' s monster is his " Wild Spider " , who he claims is undefeated . The battle starts and Koji is slightly impressed by Yugi ' s moves . Koji then points out that he forgot to mention there is one house rule that he always plays by ; The winner takes the loser ' s fighting gun and their monster . Yugi is horrified and refuses . Koji tells Yugi to watch out as he is wide open . Yugi stares at the monsters and wonders what he means . Koji calls him a fool and throws a real punch outside the game at Yugi , reminding him that he said he was wide open . Yugi falls to the ground . Koji hangs onto Yugi ' s equipment , saying he will keep it in accordance to the rules . Yugi painfully tries to get up and Koji says that he has to run as he has other appointments and laughs that he will get serious next time they fight . Classroom . Back in the classroom , Honda is telling Jonouchi about " Monster Fighter " hunters ; A lot of people at their school have fallen victim to them and the hunters are selling the games on the black market . Jonouchi angrily asks what jerk would do this . Yugi walks into the room and the two them quickly realize that Yugi has had his Monster Fighter stolen . Yugi says to Jonouchi that he would like to ask a favor . Gym . Outside the gym , Koji is selling Monster Fighters at ¥30 , 000 ( about $ 300 US at the time ) . Among the monsters for sale is Yugi ' s " Alti " , a goblin , a skull and a reptile . Koji boasts that he has a good stock and if he runs out , he will just steal some some more . He calls himself a good entrepreneur . He hears a door opening and suspects it is a customer . However he turns to see Yugi , who has since changed to Dark Yugi . Dark Yugi says that he has another one and challenges Koji to try and steal it from him . Dark Yugi is now holding Jonouchi ' s gun and monster , " Killer Emaada " . Koji recognizes Yugi from earlier , but is unaware of the transformation . Dark Yugi says that it is a rematch . Koji did not think that Yugi would find him and asks " You think you ' re pretty smart ? " . In the English version , he adds that Yugi must have a brain under all that hair . Dark Yugi explains that the game will play best out three and the game will be a Shadow Game . Koji suspects that this means there will be no rules and plans to knock Dark Yugi out again . The game starts and the two monsters battle for a while . Koji thinks Dark Yugi is a fool for playing seriously . After a few more moves , Koji raises his hand , ready to punch Dark Yugi . However , this causes him to stop concentrating on the game , leaving his monster , " Wild Spider " , right open . Dark Yugi takes the chance and " Killer Emaada " scores a critical hit on " Wild Spider " , hitting it in the jaw and knocking it out of the arena . Koji feels the force of the punch on his own jaw and is knocked back . Koji rolls on the floor in pain . Dark Yugi explains that in this game , their monsters will not be damaged , as the players act as their scapegoats . Koji now realizes there is a crack in his face in the spot where his monster got hit . Dark Yugi asks if Koji now understands that if they do not play seriously , their bodies will be broken instead of their monsters . Dark Yugi has won the first round and reminds Koji that is " " Monster Fighter " . . . the Shadow Game " . Appearances . Debuts are in bold .