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Ishizu ishtar and her family are protectors of the tomb of the pharaoh for many generations as well the carry two of the millennium items, Those items are the millennium necklace and rod. Ishizu was given the millennium necklaces and her little brother the millennium rod. Her brother was forbidden to go outside for there father was afraid that it would divert his attention from his heritage. Marik convinces Ishizu to take him outside, Shortly after his adventurer outside Marik didn't want to be tomb keeper anymore instead he want to be outside more and ride on a motorcycle however when the time came for him to get the initiation ritual he unleashed Dark Marik and killedhis father leaving Rashid to seal dark Marik away in Marik's body.
Ishizu decides to stop dark Marik from unlocking the power of the pharaoh by taking the Egyptian god card Obelisk the tormentor before dark Marik could. In battle city Ishizu is a secretary general of the Egyptian supreme council of antiquities.Ishizu becomes a museum curator in order to lure Yugi and Yami Yugi and Seto Kaiba to her.She did this so that she could save her brother from dark Marik.She gives Kaiba Obelisk the tormentor for starting a tournament also so that he can get the rest of the god cards she tells him were they are she also tells him he will end up returning the card anyways.She saw this by using her millennium necklaces.
She ends up quailing for battle city finals where she ends up dueling Kaiba.She predicts all of Kaiba moves during there duel but Kaiba acts on his instinct to summon blues white dragon. Kaiba ends up following his instincts as well as claims he makes his own future and tributes Obelisk to play blue eyes white dragon and avoids being defeated.After Ishizu defeat she give her millennium necklaces to Yugi saying that it no longer show her the future since Kaiba had changed his own.
During the finals where Yugi and Marik are dueling Odion convinces Marik to take and accpect reponsibility thus freeing him from dark Marik.Ishizu and Marik are able to fullfil lthe duites as tomb keepers by revealing the pharaoh's mermory which had been carved into Mariks back.Ishizu and Marik as well as Odion return to Egypt to start a new life. They later lead Yugi and his friends to the tomb of the pharaoh where Yugi and Pharaoh Atem duel in order to determine if the spirit will move on to the afterlife or stay in the present. When the duel is over and tomb is over Ishizu says that there family dutie is finally done.