Episode 18

A Forged Bond (偽物の絆) is the 18th episode of the Kimetsu no Yaiba TV anime series.

Synopsis
Tanjiro and Inosuke face off against the father of the Spider Demons of Mount Natagumo.

Tanjiro unleashes an attack, only to get hurled away by the demon’s overwhelming power. Landing near a river, he comes upon a young demon Rui torturing his demon sister. Hearing Rui call their bonds of terror and hatred “family ties,” Tanjiro is enraged.

So begins the battle between Rui and Tanjiro.

Plot
Upon reaching Mount Natagumo, Shinobu and Giyu come across the corpses of dozens of Demon Slayers. She as if he was acquainted with any of them, seeing him so quiet, and believes there are no survivors. Shinobu adds that they were advised that several Mizunotos have join the battle but believes them to be dead now. As they travel through the forest, Shinobu tries to comment on the full moon; Giyu ignores her, causing Shinobu to say that they should at least get along being in the mission together. Giyu retorts he is only here to kill demons. Ribbing him for acting so callously, Shinobu nonetheless agrees; they decide to split up, with Shinobu branching away to begin investigating from the west, while Giyu continues forward.

Father of the Spider Family emerges from the forest to kill Inosuke. He attempts to punch the Demon Slayer but Tanjiro intervenes with Water Breathing, Second Form: Water Wheel, cutting into his forearm. However, the demon's arm is too hard, leaving Tanjiro stuck in place and unable to cut it off. Father tries to punch him with his free arm but Inosuke slices into it to prevent him from attacking. Father flings them away simultaneously; Tanjiro lands on a nearby boulder and tries to think of a new solution. The demon runs towards him, yelling at the Demon Slayer to stay away from his family and destroying the boulder he was atop of. Inosuke leaps from behind and tries to stab Father, only for the demon to punch him away with incredible force.

Hurt by the impact, Inosuke mutters that he isn't at full power and feels the bleeding of his wounds is worsening his state. He runs away and is chased by Father; Tanjiro sprints alongside the river and used Water Breathing, Second Form: Improved, Lateral Water Wheel. He slices a nearby tree and it falls on top of Father, pinning him down. Initially confused, Inosuke sees it was Tanjiro who had done so, amazed at his skilled. With the demon pinned to the riverbed, Tanjiro sees his chance to slice its neck with the final and most powerful form. He breathes in to strengthen himself, as Inosuke watches in anticipation of seeing something incredible. He runs towards Father and uses Water Breathing, Tenth Form, only for Father to block his blade using the fallen tree. With Tanjiro stuck to the trunk, the giant demon flings him far away; Inosuke calls out to "Kentaro" and Tanjiro begs him not to die till he returns. As he sees his friend hurtling away, Inosuke is left to battle Father alone.

Atop the suspended house, Zenitsu's condition worsens as he continues his attempts to slow the poison. As he struggles to breathe, he is unable to feel his arms and legs, as they have withered away. Down below, the transformed Demon Slayers look at the house, worried for their saviour's safety. Zenitsu apologizes to Nezuko; as he loses the battle, he remembers his trainer's words to "Don't give up", giving him the hope to continue. Suddenly, something enters his vision; Shinobu lands down and asks if he is alright.

Being hurled a great distance, Tanjiro

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Эпизод 18