Yu - Gi - Oh ! - Duel 040 A Piece of His Heart is the fortieth 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 5 of the tankōbon . Summary . Kaiba Land . Kaiba is stunned that his " Blue - Eyes White Dragon s " have been blown away and that Yugi had managed to Summon " Exodia " . He starts to deny what happened , saying that it would take a miracle to Summon " Exodia " . However , Yugi informs him that miracles happen as long as you remember the Heart of the Cards . Yugi says that he wins and that there is a Penalty Game for the loser . The Eye of Anubis appears on his forehead and he announces that it is time for Kaiba to pay for his crimes . He points at Kaiba and shouts " Penalty Game ! ! Mind Crush ! ! " . A sphere appears in front of Kaiba and breaks apart like a 3D puzzle . Yugi explains that he has destroyed the part of Kaiba ' s heart that was filled with evil and says goodbye to Kaiba . Jonouchi and Anzu start to celebrate Yugi ' s victory . Anzu wonders whether it is " Yugi " or " the other Yugi " she is cheering for , but decides that it doesn ' t matter ; He ' s no longer the scared boy he once was . People in the audience are surprised that Kaiba lost to " that shrimp Yugi " , but others cheer his name . Yugi looks at his Deck and thinks to himself . He did it , he thinks to Grandpa , he beat Kaiba with his Deck and thanks Jonouchi and Anzu for being there with him , when he needed them . Johji wakes up annoyed by all the cheering . He asks what ' s going on and swears , asking can ' t they let a baby sleep . He spots Kaiba ' s guard ' s gun and quickly quietens down and decides to play dead . Jonouchi decides that something must be done about the goons holding them , but since they ' ve got guns he can ' t risk putting Anzu in danger and can ' t take on both of them alone . However someone suddenly appears and hits one of them on the back on the head . Jonouchi and Saruwatari look over and realize that it was Honda . While Saruwatari is distracted , Jonouchi kicks him in the back of the head and Honda punches him . Jonouchi is surprised to see Honda alive and Honda explains that he wasn ' t going to let a bunch of blocks flatten him . Johji and Anzu both cheer for Honda . As Jonouchi and Honda continue to hit Saruwatari , Honda says that there are two many guys asking for a beating for him to leave this world yet . The other guard gets back up and seizes Jonouchi , holding a gun to his face and threatening to kill him . However Mokuba appears and orders the guard to let him go . The guard complies and releases Jonouchi . Honda asks if Mokuba is Kaiba ' s brother . Jonouchi says that he is and he ' s just as big a creep as the other Kaiba . To Jonouchi ' s surprise , Honda says that " this creep " saved his life . He had been locked in the room for a while with blocks falling until Mokuba turned them off and helped him out . Mokuba says not to take it personally , he just owed Yugi a favor . Yugi , still as Dark Yugi appears before them , and his friends go over to congratulate him . Honda gives him and thumbs up and wishes he could have been there . Yugi is thankful to see him alive . Honda whispers to Jonouchi that Yugi seems different , but Jonouchi replies that Yugi is Yugi . Yugi thanks his friends for being there for him . Mokuba turns to leave with the guards , but Anzu calls him back and asks if he can tell her why Kaiba planned this revenge . Mokuba says that it all started with a chess game and goes on to talk about how Seto ended up the way he is . Mokuba ' s flashbacks . Shortly after Mokuba was born , their mother died . When Mokuba was three years old , their father died in an accident . When Seto and Mokuba were ten and five respectively , their relatives used up their inheritance and put them in an orphanage . Seto told Mokuba not to cry , promising to make life for them good one day . Seto would always tell Mokuba not to show weakness or it ' s all over and would advise him not to trust anyone . According to Mokuba , life at the orphanage wasn ' t so bad . Seto taught Mokuba how to play chess and they lived to play everyday . Around the time the photograph of them playing chess was taken was the last day Mokuba saw Seto smile . Not long after the photograph , Gozaburo Kaiba came to the orphanage to adopt an heir . Seto knew that Gozaburo was the president of Kaiba Corporation and a world grandmaster at chess . Seto challenged Gozaburo to a game of chess , under the condition that if Seto won , Gozaburo would adopt both Seto and Mokuba . Gozaburo laughed at first , but said that Seto was an interesting kid and accepted the challenge . Seto won , but by cheating . The boys were adopted and had their last name changed to Kaiba , but that day was the opposite of what they had hoped for . Gozaburo was a monster . he forced Seto into an accelerated school program , where Seto studied foreign languages , social studies , economics and game strategy day in and day out . As Seto studied , he was wearing a collar around his neck , which Gozaburo held a up to . However Gozaburo didn ' t realize that he wasn ' t creating an heir , but a powerful enemy . Six years later , at a KaibaCorp board meeting , Gozaburo and Seto sat at opposite sides of a table . Ten other board members also sat at the table . By the end of the meeting , the ten of them were standing behind Seto , having agreed that starting that day , Seto was the new president of KaibaCorp . Seto smirked and asked " Have I learned what you wanted . . . ' father ' ? " . Gozaburo said that he has lost his game with Seto and asked him to burn it into his brain that this is what happens to a loser , before jumping out the window , committing suicide . Kaiba smiles and thinks " lose means die " and thanks Gozaburo for teaching him that . Aftermath . In the background , the audience from Yugi and Seto ' s Duel are leaving . If Seto hadn ' t cheated in chess that day , Mokuba thinks that maybe he would still have a brother the way he used to be . Yugi explains to Mokuba that right now , Seto is picking up the pieces of heart in the darkness . Mokuba and Yugi look over at Seto who is sitting motionless in his chair , with his eyes and mouth wide open . Yugi says that Kaiba is reassembling the shattered puzzle of his heart one piece at a time with his own strength , so he won ' t make any mistakes . Inside Seto , a vision of his ten year old self is shown reassembling the sphere shown breaking when he received the Penalty Game . Mokuba asks Yugi for assurance that his brother will come back . Yugi replies that he will and that will be someday when he completes the puzzle . Mokuba vows to wait forever . Outside Kaiba Land , Jonouchi tells the group that he has received word from Hanasaki at the hospital , who says that Grandpa is okay . Yugi , who is back to his " regular self " , starts spinning around in celebration and suggests that they all go to visit him together . Johji invites himself , saying that the nurses at the hospital are hot . Honda looks at him angrily and tells him to go to sleep . Jonouchi looks at Yugi and wonders when he changed back to his usual self . Jonouchi asks Yugi for his attention , but changes his mind and says it was nothing . However , Yugi knew what he was trying to ask . That day for the first time , Yugi remembered all the battles that he fought with his other self .