Tanjiro Kamado/Synopsis

Past
Tanjiro grew up on a mountain alongside his younger sister, Nezuko, the rest of his siblings, and his mother. He is the eldest son of the Kamado family. He was very loving towards his brothers and sisters and would go out of his way to care for them, and was admired for it. He was responsible for things like selling firewood in the nearest town in order to earn money for the family.

After a demon killed his family aside from Nezuko, he realized that Nezuko had become a demon. After being confronted by and proving his resolve to Giyu Tomioka, Tanjirou was guided towards the goal of becoming a demon slayer. Since then, he has traveled with his sister in order to find a way to turn her human again.

Final Selection Arc
During the Taisho Period. Tanjiro Kamado is living a modest but blissful life in the mountains with his family.

After coming home from an overnight trip selling charcoal, Tanjiro returns to find his entire family slaughtered by demons, save for his younger sister Nezuko. Tanjiro picks Nezuko up and attempting to carry her to the nearest doctor, he discovers that she has been transformed into a demon and is attacked by her.

While Tanjiro is struggling to fend off the attack from his Demon-turned sister Nezuko, Giyu attacks the latter from behind, only for his attempt to fail as the former moves his target out of the way. Recovering quickly, the swordsman asks the youth why he protects the Demon. Tanjiro tells him it is because the creature is his sister. Looking at the maddened Nezuko, Giyu questions this statement, before swiftly removing the girl from her brother's grip.

As Tanjiro called out to his sister in alarm, Giyu told him not to move, stating that it is his job to kill Demons like Nezuko. The swordsman then listens to Tanjiro's attempt to defend his sister and explain their current predicament, commenting that her change in demeanor is simple to explain: any open wound bathed in Demon blood causes that person to become a Demon themselves, thus increasing their overall numbers. Tanjiro exclaims that his sister hasn't eaten any people, Giyu reminds him of what had just transpired, shortly thereafter bluntly commenting that there is no way to cure a person once they are turned into a Demon, despite Tanjiro's plea to the contrary. As Tanjiro continues pleading, Giyu brought his sword up to Nezuko's throat.

Tanjiro then prostrates himself before the swordsman, begging for his sister's life, Giyu grew angry, stating that the youth has no authority over who lives or who dies, as he was too weak to protect his family, and that all of his talk about finding a cure for his sister's condition and finding his family's killer is ridiculous. Stating that neither he or the Demon Lords would have any respect for such a miserable display, Giyu demands that Tanjiro prove his dedication to protecting his sister by drawing his axe. As the youth pondered these words, Giyuu silently encourages him to find the resolve necessary to accomplish all of the lofty goals he had placed upon himself. He then stabs Nezuko in the chest, causing Tanjiro to throw a stone at him in fury.

Giyu blocks the stone with the hilt of his sword, avoiding another of the projectiles as Tanjiro charged at him empty-handed. Seeing the attack attempt as only a simple act of emotion, the swordsman angrily drove the hilt of his sword into his attacker's back, knocking him to the ground. Staring down at the fallen youth, Giyu wonders where his opponent's axe was. Looking up, he sees the weapon spinning towards him through the air, and narrowly dodges it. He then mused over Tanjiro's clever strategy, realizing that the youth's plan had been to take him out even though he would have perished as well. Distracted, the swordsman is attacked by Nezuko, dodging backward from her kick. Cursing himself, Giyu watches as the girl reached for her brother, certain that she was going to devour him. To his surprise, she instead stood protectively in front of his prone body, before charging at him in rage. Giyu recalled Tanjiro's previous assertion that Nezuko wouldn't eat humans, noting that somebody a long time ago had said the same thing and had been killed regardless. He further reflected on the nature of Demons, in particular, the high amount of stamina lost during the transformation process, and what they do to alleviate the lost stamina and prevent starvation: eat humans, even those closest to them. Seeing that Nezuko was not following this example, Giyu sheathed his sword, incapacitating the unusual Demon with a barehanded blow to the neck.

While Tanjiro and Nezuko were unconscious, Giyu wraps the latter in a clean cloth and straps a bamboo muzzle-like tube across her mouth. When Tanjiro regained consciousness, the swordsman instructed him to visit Urokodaki Sakonji, and also to not take his sister out in the sun, before leaving swiftly.

Natagumo Mountain Arc
Their next destination is to the north-northwest. Tanjiro and Nezuko head towards Mount Natagumo with Zenitsu and Inosuke. This mountain is covered with spider webs and is swarming with innumerable spiders. Leaving the cowering Zenitsu behind, Tanjiro and Inosuke head up the mountain where they run into fellow Demon Slayers entangled in spider webs.

Navigation
Танджиро Камадо