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At the end of Demon Slayer: Kimetsu no Yaiba Infinity Castle (2025), the Demon Slayer Corps confronts and defeats the Upper Rank demons within Muzan Kibutsuji's Infinity Castle. Tanjiro and Giyu defeat Akaza, Zenitsu overcomes Kaigaku, and Shinobu, Kanao, and Inosuke kill Doma. The combined efforts of Muichiro, Sanemi, Genya, and Gyomei lead to Kokushibo's defeat. Nakime is killed by Muzan to prevent her powers from being used against him, causing the Infinity Castle to collapse. The battle sets the stage for the final confrontation with Muzan.

The movie opens with the Demon Slayer Corps entering the Infinity Castle, an otherworldly, shifting fortress controlled by Nakime, Muzan's subordinate. The castle's strange gravity and endless rooms create a disorienting battlefield.

The first major fight is Tanjiro and Giyu Tomioka versus Akaza, the Upper Rank Three demon who had previously killed Kyojuro Rengoku. Tanjiro and Giyu combine their skills to finally avenge Rengoku's death by defeating Akaza after a fierce battle.

Meanwhile, Zenitsu faces Kaigaku, his former classmate who became a demon. This fight is both a physical and emotional confrontation, as Zenitsu seeks to prove himself and avenge their shared master, Jigoro. Zenitsu ultimately triumphs, reclaiming his confidence and honor.

In another part of the castle, Shinobu Kocho, despite severe injuries including a shredded lung from Doma's fog attack, summons her resolve. Encouraged by the spirit of her late sister Kanae, Shinobu uses her Insect Breathing techniques to launch a surprise attack on Doma, the Upper Rank Two demon responsible for her and Kanao's tragic pasts. She drives her sword through Doma's neck, killing him after a tense and painful struggle.

Simultaneously, Muichiro Tokito, Genya Shinazugawa, Sanemi Shinazugawa, and Gyomei Himejima confront Kokushibo, the Upper Rank One demon and the strongest of Muzan's subordinates. Kokushibo reveals his connection as Yoriichi Tsugikuni's twin brother and ancestor to Muichiro and Genya. The battle is intense and costly, but the Demon Slayers' combined efforts lead to Kokushibo's defeat.

Obanai Iguro and Mitsuri Kanroji engage Nakime to stall her, allowing Yushiro to gain control over her. To prevent this, Muzan kills Nakime, which causes the Infinity Castle to begin collapsing.

As the castle crumbles, the Demon Slayer Corps prepares for the final battle against Muzan, setting the stage for the next arc.

In terms of character fates at the end of this movie:

• Tanjiro Kamado survives the battles and gains closure by avenging Rengoku and defeating Akaza.

• Zenitsu Agatsuma overcomes his former friend-turned-demon Kaigaku, proving his growth.

• Shinobu Kocho sacrifices herself to kill Doma, fulfilling her promise to protect others from suffering.

• Kanao Tsuyuri and Inosuke Hashibira survive, having avenged their pasts by killing Doma.

• Muichiro Tokito, Genya Shinazugawa, Sanemi Shinazugawa, and Gyomei Himejima survive their brutal fight with Kokushibo, though the battle is taxing.

• Nakime is killed by Muzan to prevent her powers from being used against him.

• Muzan Kibutsuji remains alive but cornered, setting up the final confrontation.

This ending highlights the Demon Slayers' perseverance and the heavy costs of their battles, emphasizing themes of sacrifice, resolve, and the fight against overwhelming evil.

Yes, Demon Slayer: Kimetsu no Yaiba Infinity Castle (2025) does have a post-credit scene. This scene is part of the tradition in the Demon Slayer franchise known as the Taisho Era Secrets, which are short segments presented after the credits that reveal additional character backstories, fun facts, or emotional moments that complement the main story. These post-credit scenes often provide deeper insight into characters' motivations or pay tribute to their legacies, such as Giyu's haori tribute or Rengoku's inspiring legacy.

Specifically for Infinity Castle, the post-credit scene continues this pattern by offering an emotional or revealing moment related to the characters, enhancing the emotional impact of the film's conclusion. While the exact content of the Infinity Castle post-credit scene is not fully detailed in the search results, it is described as an "epic" scene that has generated significant buzz among fans, suggesting it is both meaningful and impactful.

Additionally, voice actors have expressed strong emotional reactions to the film and its ending, indicating that the post-credit scene likely ties into the emotional themes of trust, sacrifice, and the looming challenges the characters face, especially focusing on characters like Kanao and Shinobu.

In summary, the post-credit scene in Demon Slayer: Kimetsu no Yaiba Infinity Castle is a short, emotionally resonant segment that fits within the franchise's tradition of Taisho Era Secrets, providing fans with additional character insights and emotional closure beyond the main narrative.

In Demon Slayer: Kimetsu no Yaiba Infinity Castle, the Demon Slayer Corps, including Tanjiro, Nezuko, and the Hashira, engage in desperate fights against the terrifying Upper Rank demons inside the Infinity Castle. Notable battles include Zenitsu's fight against Kaigaku, a fellow apprentice turned Upper Rank demon, Shinobu's death at the hands of Douma, and the victory of Tanjiro and Giyu over Akaza. These battles form the core of the final confrontation against Muzan Kibutsuji's forces.

The Infinity Castle is a mysterious, labyrinthine stronghold created by Muzan Kibutsuji where the Demon Slayer Corps are drawn into for the final battle. It serves as a complex battleground where the Demon Slayers face the Upper Rank demons in a series of intense fights. The castle's design traps the characters in a deep descent, isolating them and forcing confrontations with powerful enemies in a confined, shifting space.

Muzan Kibutsuji's sudden appearance at the Ubuyashiki Mansion marks the beginning of the final battle arc. His attack plunges Tanjiro and the Hashira into the Infinity Castle, setting the stage for the climactic confrontations. This event signals the escalation of the conflict to its peak, with the Demon Slayer Corps facing their ultimate enemy in his stronghold.

Several Hashira play critical roles in the Infinity Castle battles. For example, Shinobu Kocho confronts Douma but ultimately dies in the fight. Other Hashira such as Kyojuro Rengoku, Tengen Uzui, Muichiro Tokito, and Mitsuri Kanroji have been featured in earlier arcs and training leading up to this battle. The film focuses on the collective efforts of the Hashira alongside Tanjiro and Nezuko against the Upper Rank demons, highlighting their strengths and sacrifices.

During the final battle in the Infinity Castle, Tanjiro and Nezuko are portrayed as deeply determined yet physically and emotionally strained. Tanjiro's resolve to protect his sister and defeat Muzan drives him through intense fights, while Nezuko's demon powers and bond with Tanjiro are crucial in combat. The film emphasizes their growth, the weight of their mission, and the toll the battle takes on them, underscoring their resilience and the emotional stakes of the conflict.

Demon Slayer: Kimetsu no Yaiba Infinity Castle, released in 2025, is rated PG-12 in Japan, indicating it may not be suitable for young children without parental guidance due to its content. The movie, like other entries in the series, likely includes:

• Graphic Violence: The series is known for intense and gory combat scenes, which could be disturbing for sensitive viewers.
• Mature Themes: Themes of grief, revenge, and death are prevalent, which may be emotionally challenging for younger audiences.
• Psychological Content: The series often explores complex psychological states, such as trauma and emotional distress, which could be upsetting for some viewers.

Given these elements, while the movie is not explicitly family-friendly for all ages, it depends on individual tolerance and parental discretion.

In the 2025 movie "Demon Slayer: Kimetsu no Yaiba Infinity Castle," there is no information in the available search results indicating that the dog dies. The plot centers on the Demon Slayer Corps, including Tanjiro, Nezuko, and the Hashira, fighting Upper Rank demons in the Infinity Castle, but no mention is made of a dog character dying.

The search results do not provide detailed plot summaries or specific character fates beyond the main human characters and demons. Therefore, based on the current information, the dog does not die or at least it is not a notable plot point reported in the sources available.