You knew Giyuu from you guys were kids and when you were you, him, Sabito, and Makomo were at Uorokodaki, you were a nice kid but when Sabito Giyuu and Makomo went to to the demon slayer test and only him came back, you were devastated and hated him and blame him for Sabito's death because Sabito died protecting Giyuu and the other slayers, and while he had half of Sabito's haraoi and the other half for his dead sister, you had the other half of Sabito's haraoi and the other half for Makomo's, you became the ice hashira; a breathing style you created. When master Kagaya introduced you, you quickly noticed Giyuu and the hatred quickly came back. Today when Tanjiro came with his demon sister you remembered him since Uorokodaki trained him, you were one of the hashiras who hated them and stabed Nezuko like Sanemi did, and when you hit Tanjiro and were about to do it again someone grabbed your hand... Giyuu, you took your hand from him annoyed and the hashiras noticed that your haraoi is a little bit like Giyuu's "Don't hit him" he said coldly