Demon Slayer's final episode picked up immediately after its predecessor: Tengen and Inosuke on the brink of death, Yoshiwara district in shambles, and the demon siblings promptly out of sight.
After Mugen Train, everyone was convinced that there would be major character deaths this season, and Uzui wasn't giving us any reason to disagree. Is that how it really ended, though? What happened at the end of Demon Slayer season two?
Thanks to Nezuko's Blood Demon Art, Uzui and the rest survived Gyutaro's final attack. She used her demonic blood fire to neutralize Gyutaro's poison, healing everyone immediately.
Uzui still lost an eye and a limb, though. He'd been injured gravely during his showdown against Gyutaro, and though he survived the poison, the fight did take a toll on his body.
But it's a small price to pay for their victory. Besides, it's not like his disability weakened him. Uzui gave his opponent an equally hard time with a single-arm, and even if he could no longer be a match for the Upper-Rank Demons, he could take on other powerful demons without much problem.
Having barely escaped death, Uzui decided that it was about time he and his wives got to live peacefully. He announced his retirement to Obanai and said he was sure their master (Kagaya) would forgive him.
Obanai tried to stop him, telling him he was being ridiculous.
Uzui replied that contrary to Obama's belief, the youngsters were growing up well and that Tanjiro and his friends would soon step into more powerful ranks.
Though the Sound Hashira will remain retired for the rest of the series, he will appear during the Hashira Training Arc to help Tanjiro train. He and his wives will also appear during the show's epilogue, as they visit Tanjiro after the final battle against Muzan.
Apart from these, Uzui won't be making any appearances on the show.
Towards the end, Tanjiro, Zenitsu, and Inosuke figured out that to defeat the demon siblings, they'd have to behead them simultaneously. They poured all of their energy into a final blow and managed to decapitate the siblings, finally killing them.
When Tanjiro woke up, he saw the demons quarreling amongst themselves as they dissolved. Daki blamed her brother for their defeat and told him that there was no way she could be related to someone as ugly as him.
Gyutaro retaliated, blaming Daki for the way his life turned out. He was about to tell her that he wished she'd never been born, but Tanjiro covered his mouth before he could finish.
The parallel between the demon siblings and the Kamado siblings was beautifully portrayed here. Tanjiro understood that neither of them meant what they were saying and didn't want their last words to each other to be of hatred.
And he was right. When Daki finally died, Gyutaro yelled her real name, Ume, in agony. He remembered their past and blamed himself for ruining Daki's life.
In the end, the siblings met again in Limbo. Gyutaro was still a demon, but Daki looked like her human self again. She was standing in front of a light, and he knew he couldn't go with her. So he told her not to follow him, but she refused.
Gyutaro told her to keep following the light, but Daki ran towards him and told him she'd never leave him.
She reminded him of the promise he made her when they were young. He'd told her he'd never leave her side, no matter what.
Gyutaro, overcome with tears, held onto his sister as the memories returned, and the two walked into Hell together.
When 13-year-old Daki poked a samurai's eye out, the District people tied her up and burned her alive. (Though the anime never explained why she did that, the manga mentioned that she did it because the man insulted Gyutaro.)
By the time Gyutaro came back, his sister was burnt to crisp, barely holding on to life. Enraged, he started cursing the heavens, telling the gods that if they didn't bring his sister back, he would kill them.
He walked around the whole district looking for help, but everybody closed their doors on them. The two of them would've died if Douma, the Upper-Rank Six demon, didn't take pity on them. Douma gave them his blood and turned the siblings into demons, wondering if they could grow strong enough to join the Upper-Ranks.
Douma is an Upper Rank Two demon and the third strongest demon on Demon Slayer. He's the one who killed Shinobu's sister, and he's known for being particularly sinister. Expect to see more of him in the Infinity Castle Arc.
Even as a human, Douma was incapable of feeling emotions. When his parents killed themselves in front of him, all he did was complain about the stench of the blood.
These tendencies were only amplified when Muzan turned him. Douma is one of the scariest demons on Demon Slayer, not just because he's powerful but because he's truly psychotic.
Tanjiro finally unlocked his Demon Slayer Mark in the Entertainment District Arc. Similar to the crests the demons possess, the Demon Slayer Mark grants its user enhanced abilities, though it comes with a hefty price.
The mark can only be awakened when a Demon Slayer pushes their limits beyond survivable conditions: the Slayer must achieve a heart rate of over 200 bpm and a body temperature over 39° Celsius (102.2° Fahrenheit). If the Slayer reaches these conditions and continues to fight, their Demon Slayer mark is awakened, granting them an insane power boost.
Of course, there's a catch: any Demon Slayer who awakens their mark doesn't live past the age of 25. In the words of Gyomei Himejima, the Stone Hashira, "you pay your lifespan in advance for a greater physique."
Tanjiro will awaken his mark again in the Swordsmith Village Arc when he takes on an Upper-Rank Four.
READ MORE: Demon Slayer Swordsmith Village Arc Confirmed!
In the post-credits of the second season, we see Akaza being summoned to the Infinity Castle. This scene was likely foreshadowing the Infinity Castle Arc, the biggest and most prominent arc in Demon Slayer.
The last time Muzan summoned demons to the castle, he slaughtered the Lower-Rank Six demons for failing to kill Tanjiro. However, the Upper Ranks hadn't been summoned for over a hundred and thirty years.
Now that Daki and Gyutaro have been defeated, Muzan must've summoned the rest of them to punish them and maybe plot against the Demon Slayer Corps. It's hard to tell, but manga fans know this is a tease about what's coming ahead.