قسمت 21: رُئی خاطرات گذشته‌اش را به یاد می‌آورد و تانجیرو پس از نبرد با هاشیرا روبرو می‌شود.

As Rui dies, he is finally able to remember his human life. He was born with a frail body, rendering him bedridden - until Kibutsuji took pity on him and turned him into a demon, giving him a strong body. His father then tried to kill him while his mother did nothing, so Rui slew them both, thinking they weren't his real parents as parents were supposed to protect their children. His mother's last words were that she was sorry she couldn't give Rui a strong body, and his father had intended to commit suicide after killing him. He realizes too late it was a genuine bond after all, which traumatized him. Kibutsuji returned and told him it was his parents' fault for not accepting him and Rui accepted that rather than the truth. He missed his real parents so much he suppressed the memory of them, but was never satisfied with his fake family. Tanjiro regains consciousness as Rui's body collapses just before reaching him and Nezuko. Overwhelmed by the scent of grief he detected from it, Tanjiro reaches out to Rui. Rui apologizes to his parents as he fades away, his spirit able to reunite with his parents'. Giyū steps on Rui's clothing after his body dissolves, and Tanjiro pleads with him not to, explaining that he will kill demons without hesitation but believes they are more tragic than terrifying creatures. Giyū suddenly recognizes Tanjiro and Nezuko from their meeting two years ago. Shinobu runs towards them and Tanjiro shields Nezuko with his body as Giyū blocks Shinobu's blade from striking Nezuko's neck, surprising her when he takes a defensive stance in front of the siblings. Giyū tells him to take Nezuko and run while he holds off Shinobu, which Tanjiro does. Tanjiro is suddenly kicked to the ground by Kanao Tsuyuri, the girl who completed Final Selection with Tanjiro, one of Shinobu's clanmates. Tanjiro tells Nezuko to run, only to be knocked unconscious by Kanao, who then tries to kill a fleeing Nezuko. Giyū has pinned Shinobu, who warns him he is acting against Corps rules. Kasugai crows, who had been watching, interrupt everyone by saying Tanjiro and Nezuko were to be taken into custody and brought back to headquarters, so Kanao, Giyū, and Shinobu all sheathe their blades. Inosuke is found, but seethes to himself as he couldn't do anything to stop a demon, and begins to ponder on the reality of his strength. Zenitsu and the other victims of the elder son, even those now spiders, have been treated by the Kakushis, a cleanup unit of the Corps, and are to be brought to the Butterfly Mansion for further treatment. The sun rises at last. Tanjiro later awakens, tied up, before the Hashiras, the lead swordsmen of the Demon Slayers. (Source: Wikipedia)

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