Being Core No. 89, she was named 'Haku' by her former Dungeon Master. Haku can mean 89 or the color white, after her white hair. She is one of the strongest and most influential dungeon cores, among the top in ranking. She is also one of the most influential within the Laverio Kingdom, and is the core to the Ivory Labyrinth that contains the capital city of Laverio. She is worshipped as the White Winged Goddess.
She is Rokuko's older sister, and is extremely doting and protective of her.