Professor Yoshimori Professor Yoshimori ( " Yoshimori Kyōju " ) is a character in the " Yu - Gi - Oh ! " manga . He is a Domino University professor who is into archaeology . He is friends with Sugoroku Mutou . Biography . Yoshimori has a wife and son , but neglected them in favor of his work . Yoshimori , alongside Curator Kanekura , entered a tomb in the Valley of the Kings the and excavated many artifacts . Yoshimori did not believe in curses , and was not worried when he violated the tomb . Unbeknownst to them , Shadi was watching and planning to punish them . Two months later , Kanekura and Yoshimori put the items that they found in the tomb on display in the Egypt Unearthed exhibition at Domino City Museum . Being an old friend of Sugoroku Mutou , Yoshimori gave free admission to the exhibition to Sugoroku , his grandson , Yugi and their friends . He showed them around the exhibition , telling them about archaeology and explained the Weighing of the Heart ritual , as they admired a sheet of papyrus , depicting the ritual . Shadi also attended the exhibition that day , hoping to pass judgment of Kanekura and Yoshimori . He secretly killed Kanekura for failing the Weighing of the Heart . Although the death appeared as a heart attack , people suspected that it was the curse of the pharaoh , which even though Yoshimori did not believe in them , he became worried over this . Sugoroku knew that Yoshimori couldn ' t be taking the news of Kanekura ' s death well , so he Yugi , Jonouchi and Anzu went to the university to cheer him up . Shadi went to the university , to pass judgment on Yoshimori . Before doing so , he entered his soul room and found that Yoshimori was expecting his friends , including Yugi to arrive . Eager , to test Dark Yugi in a Shadow Game , Shadi redecorated Yoshimori ' s soul room , turning him into a " zombie " , with the motive to make Yugi ' s friends suffer , hoping this would draw Dark Yugi out . Yugi , Sugoroku , Jonouchi , and Anzu came to Yoshimori ' s office for a cheer - up party . However , Shadi got Yoshimori to strangle Jonouchi as to make the Yugi ' s " other side " come out . Jonouchi ' s friends unsuccessfully tried to pull him off Jonouchi . Anzu successfully got him to let go by hitting him with a globe , knocking out three of his teeth . Shadi then decided that possessing Yoshimori won ' t be enough and redecorated Anzu ' s soul room too . Yoshimori tried to attack Jonouchi again , but Sugoroku stood between them , asked the professor what is going on and tried to remind him that they were friends . The professor punched Sugoroku away , knocking him unconscious . Jonouchi tried to draw the zombie professor away from Yugi and Anzu , so he started making gestures at the professor , prompting him to chase Jonouchi around the building . Jonouchi lead Yoshimori away and punched him hard in the face , hoping it will knock him back to normal . This took out more of the professor ' s teeth , but he got - up and continued chasing Jonouchi . Jonouchi reached a dead - end and led the professor into a room , where he sprayed him with a fire extinguisher . The professor knocked the extinguisher out of Jonouchi ' s hands and pushed him out the window . Jonouchi managed to grip onto the wall and saw Anzu standing motionless on a board over the edge of the building overhead . He climbs up to help her , while the professor chased after him . At the climax of Yugi ' s Shadow Game with Shadi , Jonouchi held up the board to prevent Anzu from falling . However Yoshimori started pulling at his leg . Dark Yugi instructed Jonouchi to make Yoshimori touch the Millennium Key . Jonouchi complied and Yoshimori was returned to normal . Yoshimori was shocked to find himself high - up on the side of the university and missing a number of teeth . He and Jonouchi climbed up onto the roof , where Yugi and his friends confronted Shadi over using them in this game . After Shadi departed , Yoshimori commented that he had no memory of what happened and Jonouchi tried to blame Anzu for breaking his teeth . He apologized for not being able to offer them anything , but Sugoroku treated them all out to a meal instead .