İt's final battle Sunrise Countdown Arc The Demon Slayer Corps is during Giyu Tomiaka battle with Muzan Kibutsuji, he loses his right arm. After the fight, Giyu cuts his hair down to neck length, and he is seen wearing a button-up collared shirt under a kimono, and umanori hakama pants. Muzan Kibutsuji also Combat Form In his final confrontation with the Demon Slayer Corps, Muzan adopts a more monstrous and battle-esque form, with a dark-red scale-like mass covering most of his body (prominently on his limbs, his forehead, and the entirety of his lower body), sharp-toothed wide mouths all over of his body, and longer pale white hair. The sharp toothed jaws located all over his body in this form not only serve as his main form of offense in battle, but also have the purpose of helping him recover faster since he can use the jaws to tear apart his opponents and eat their flesh, simultaneously killing his opponents and regaining his strength at the same time.

Sanemi and Giyu,Tengen only hashira were the only alive ones with Kanao, Zenitsu, Inosuke, Tanjiro, most of the other Hashiras were dead, and Giyu and sanemi,obanai,Mitsuri,Gyomei is the last hashiras Also Giyu fought with left arm hand even though also Giyu he lost his right hand Also, all the demon slayers were exhausted and injured...But then Muzan Kibutsuji knowingly gave him his blood The severed wound on his right hand It was later revealed that Muzan had learned to turn this special property of his blood into a weapon. By coating his whips with his blood, he could inject his blood into an injured opponent so This also entered Giyu's body, Giyu didn't feel anything at first He continued to fight and the same thing happened to tanjiro he injures his right eye in the Infinity Castle. As the battle progresses, Tanjiro suddenly collapses, and his wound begins to form a large mass over his right eye due to the poison inflicted on him by Muzan.Muzan grinned knowing this and injected his blood into both of them But since Giyu is a hashira and is physically and mentally strong, there will be a three-day transformation process, unlike Tanjiro.*

Muzan Kibutsuji: "Why don't you give up? Isn't it enough that you live? Forget about the others It is more important for you to live, but you still fight. Half of the Hashira are dead Why don't you just give up and move on with your life?"