
Summary
- Muzan forcefully turns Tanjiro into a demon, causing immense grief among his friends, especially Nezuko, who desperately tries to bring her brother back.
- After losing many comrades, including Tanjiro’s near transformation, Giyu faces deep sorrow, struggling with survivor’s guilt despite his stoic demeanor.
- Many Hashira, including Sanemi and Gyomei, make ultimate sacrifices in the final battle, leaving behind emotional farewells and shattered dreams of a peaceful future.
Most of the demon slayers died after the final battle in the Infinite Castle arc against the Uppermoons and Muzan Kibutsuji. The Hashira and the demon slayer corps win a sacrificial battle against the Demon King Muzan ending the 1000-year battle between the demons and the demon slayers. There are a few saddest facts in the Demon Slayer anime that will make the fans cry at the end of the series.
Pain of losing a sister
Kiyo, Sumi, Naho, and Aoi are the butterfly triplets in the demon slayer who takes cares of the mansion and the aided demon slayers. After the death of Shinobu in her Battle against uppermoon two Douma, Shinobu’s body was never found as she was eaten by Douma after her death. But the saddest fact is that the butterfly triplets still thinks that Shinobu is alive and will return soon to the mansion.

Yushiro’s love for Tamayo
Yushiro always loved Tamayo over everything as he didn’t had no one other than her. In her Battle against cornering Muzan Tamayo sacrifices herself for the sake of her ambition that she had all these years to take revenge for the death her husband and her child. After the death of Lady Tamayo, Yushiro painted the drawing of Tamayo’s face everyday so that he should not forget how she looks like.

Sanemi’s sadness and control over his mind
After losing his little brother Genya, Sanemi thought that he had nothing to protect in this world. Sanemi loved his little brother so much and he never wanted him to become a demon slayer as he doesn’t wanted him to die. After the tragic death of Genya Sanemi started the habit of drinking everyday to forget his pains. But he later remembered that his father was always abused his mother by drinking everyday and he never wanted to become a person like him.

The Bond of Brotherhood
Senjuro the little brother of Rengoku stopped celebrating his birthday after the death of his brother in his battle against the uppermoon three Akaza. Kyojuro’s father was never been a friendly father with his children after the tragic death of his wife he started drinking and always be rude to his children. His father never celebrated his birthday and Rengoku was the only one who celebrated his birthday alongside him. After his death, he was left with no one to celebrate so he even stopped celebrating.

Inosuke’s cry of friendship
Inosuke shares a weird friendship with Tanjiro where he never pronounces his name properly everytime. The first and the final time when inosuke calls tanjiro properly and accurately was the time where he asked to kill Tanjiro as he had started transforming into the demon form.

Shinobu’s Guilt
After the death of her sister Kanae Shinobu punished herself and suffered in Guilt trip as she couldn’t save her sister. And because of this she never visited her sister’s grave as she blamed herself for Kanae’s death.

Eternal love of Koyuki and Akaza
The backstory of Akaza is all filled love with his life and ends with her tragic death. Akaza lost his pathway as a human due to her death which made him a demon. After the defeat of Akaza by Tanjiro and Giyu, he was ofcourse sent to hell for all the sins he committed. Koyuki, Akaza’s wife also decides to go hell from heaven so that Akaza doesn’t feels lonely in his afterlife.

Brothers by heart Genya and Muichiro
Genya and Muichiro in their battle with Uppermoon one Kokushibo they use their sword form and demon blood art powers to defeat him. While using the blood demon art Genya succumbes and vanishes just like every demon and on the other hand Muichiro was cut down into two halves by kokushibo where one part of his body remained forever in the infinite castle. The tragic and the heartbreaking fact is that they both thought that the other one survived and escaped but the truth is both didn’t.

Shinobu's Sacrificial Play
From the very moment while entering the infinite castle Shinobu was ready to sacrifice herself against Douma with her poison technique and she technically shared her play with everyone other than Giyu. As she knew he will never let her allow to do this for anyone’s sake.

True love never ends
Mitsuri and Obanai loved each other even in their deathbed which makes every fans cry their hearts out. In her Battle Mitsuri loses both of her hands which makes her unable to hold him. During her final moment she asks Obanai whether he will accept her as his bride in the next life if they born as humans. Obanai promises and hugs her so tightly that the corps never able to separate them so they buried them together.

Sanemi's tears for the result
After the completion of the final battle Sanemi finds a ring that Obanai has kept for Mitsuri to propose her but he couldn’t. Sanemi buried the ring in the grave where they both were buried together.
