Chapter 129

To Become a Marked One (のになるためには) is the one hundred and twenty-ninth chapter of Koyoharu Gotoge's Kimetsu no Yaiba.

Summary
Muichiro Tokito explains that he was consumed by his anger and lost complete control of his emotions. He says that he thinks that his heartrate exceeded 200 beats per minute and his body temperature went over 39 degrees Celsius. Muichiro also believes that those who do not have the mark appear, even though they do have the qualifications, do not get the mark because they will die, but those whose bodies can withstand these extreme circumstances will have a mark appear and enhance their ability to fight. Muichiro says that when Shinobu Kocho was treating his wounds, he was reported to have had a fever. It was then established that they would have mark training and that anyone who had gotten the Mark would have to participate. Amane Ubuyashiki leaves and the Hashira are about to have a discussion about the training before Giyu Tomioka stands up claiming that there is no need or reason that he has to stay any longer. The other Hashira are confused as to why he doesn't think he needs to be there, but his only explanation is that he is not like them. The meaning to his words, we find out later, is that he does not think he is worthy or should have become the Water Hashira. But the other Hashira do not know so, so Sanemi Shinazugawa lashes out and asks what Giyu means, misinterpreting his words as Giyu thinking that he is better than everyone else, even though what the man actually meant was the exact opposite. A fight breaks out because Giyu doesn't explain himself what he means, but it is soon resolved, as Gyomei Himejima says that they should all just sit down, because he has a proposition.

At the Butterfly Mansion, Hotaru Haganezuka arrives to deliver Tanjiro Kamado his sword. The swordsmith is huffing and puffing behind his mask with visible sweat coming off the mask. Hotaru gives Tanjiro his sword and sits down at Goto's request. He passive-aggressively urges Tanjiro to unsheathe the blade. Tanjiro is in awe by the blade. Haganezuka says that it is made from high quality steel and must have been used previously by a very strong swordsman. The blade has the character Slay carved on it. Hotaru theorizes that this blade was forged before the Demon Slayer Hierachy was established and was why many of the Hashira have the phrases Destroyer of Demons, meaning destroy all evil demons, on them. Tanjiro then says that he did not remember seeing those words on the sword when he had used it. Hotaru is set into an angry monologue on how that is because there was still rust on the blade and Tanjiro has put irremovable damage on it. He then leaves after Tanjiro promises to bring him Mitarashi Dango until the day he dies. An annoyed Genya Shinazugawa in the bed next to Tanjiro then complains about how noisy Tanjiro and his guests were. Tanjiro promises that that was the last of it, but he doesn't get to finish because Inosuke Hashibira enters the room by breaking through the window of their room from the outside. The shirtless boy is here with news about a super hard training session they are going to have.

Characters in Order of Appearance

 * Kotetsu
 * Muichiro Tokito
 * Mitsuri Kanroji
 * Shinobu Kocho
 * Amane Ubuyashiki
 * Sanemi Shinazugawa
 * Giyu Tomioka
 * Obanai Iguro
 * Gyomei Himejima
 * Tanjiro Kamado
 * Hotaru Haganezuka
 * Goto
 * Genya Shinazugawa
 * Inosuke Hashibira

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