Imori Imori is a character in the " Yu - Gi - Oh ! " manga . He is a student at Domino High School . Withdrawn and somewhat shy , Imori is then revealed to be anti - social and selfishly vindicated . Biography . Imori ' s grandfather was a game collector and left him books about games and ancient Egypt . While reading one of them he learned about the Millennium Item , an item in the possession of his classmate , Yugi Mutou . The book stated " The one who solves the Millennium Puzzle shall gain the thousand ways of the Shadow Game s and become the Guardian of Darkness . " Imori noticed that Yugi was often bullied until he began wearing the Millennium Puzzle and deduced that Yugi had acquired the powers of darkness . He swore to himself that he would defeat Yugi and take his place as the Guardian of Darkness . Imori ' s grandfather had acquired the Dragon Cards game in Manchuria , during World War II . Imori eventually found them in his garden shed , but did not know exactly what they were . He brought them to Yugi ' s family ' s game shop , Kame Game , to ask if Sugoroku Mutou had any knowledge on the game . Yugi had not spoken much to Imori before and thought this could be a chance to make friends with him . Sugoroku recognized the game and was insistent that its seal was not to be undone . He explained that with the cards and seal , represented by respectively , they were currently in balance , but breaking the seal would cause a disrupt that and cause a warped power . Sugoroku asked Imori to promise not to break the seal . He lied that he would not , but was secretly fixated on the power of shadows that Sugoroku said had been sealed . After leaving the store , Imori did further research on the cards . He learned that once the seal is broken , a Shadow Game must be played or the people of the land will suffer eternal disaster and the loser of the Shadow Game must offer their soul to the soul - eating jar to calm the wrath of the dragons . He learned the rules of the card game and studied them to the point where he was confident he knew all the ways to win . With this knowledge , he plotted to defeat Yugi in a Shadow Game to usurp the power of the Millennium Puzzle . A few days after visiting the store , while their class were swimming , Imori stole the Millennium Puzzle from the changing room and left Yugi note , instructing him to come to Room C alone . When Yugi arrived , Imori told him what he knew about the Millennium Puzzle and of his intentions to usurp its power . He then broke the seal on the Dragon Cards , forcing Yugi to accept a Shadow Game . With his vast knowledge of the game and Yugi unable to access the puzzle , Imori was confident he would win their game . Judging by the cards Yugi discarded during the game , Imori deduced he was trying to summon a Huo Long and a Jin Long , the fire and metal dragons . To counter them Imori gathered the cards needed to summon two Shui Long , the water dragons . With fire weak to water and water strengthened by metal , Imori easily won and Yugi ' s soul was pulled into the soul - eating jar . Before collapsing , Yugi grabbed the puzzle , causing Dark Yugi to come out . Dark Yugi staked his soul to challenge Imori to another game . Imori figured he would need to defeat Dark Yugi too in order to become the Guardian of Darkness , so he accepted . Again , Imori was able to figure what dragons his opponent planned on summoning . Knowing Dark Yugi planned on summoning the Level 4 earth dragon , Tu Long and Level 5 metal dragon , Jin Long , Imori gathered the cards to summon the Level 5 water and wood dragons , Shui Long and Mu Long . With his water dragon strengthened by the metal dragon , Imori got it to attack , but with earth empowering metal , Dark Yugi got his earth dragon to create a dam to block the attack . Imori ' s water dragon strengthened his wood dragon , which attacked the earth dragon , by draining its power via its shoots . The water dragon attacked the metal dragon , but having given its strength to the wood dragon , only succeeded in weakening the metal dragon . The metal dragon sliced the wood dragon apart before being defeated by the water dragon . The freed earth dragon , shattered the ground , causing the water dragon to sink into an abyss . Having lost the game , Imori ' s soul was sucked into the soul - eating jar , to be eaten by twenty five dragons . Since the jar could only hold one soul at a time , Yugi ' s soul was freed . The second Dragon Cards game ended with Imori losing . Imori ' s soul was then sucked into the soul - eating jar , to be eaten by twenty - five dragons , while Yugi ' s soul came out and was re - absorbed into his body unharmed .