Kimetsu No Yaiba Episode 21 -

The rest of the team—Inosuke and Zenitsu—are rescued and sent for treatment at the Butterfly Mansion.

The arrival of the Hashira shifts the focus to the Demon Slayer Corps rules regarding Tanjiro and Nezuko.

When his parents discovered his monstrous nature, they attempted a murder-suicide to stop his sins. In a rage, Rui killed them, believing their bond was fake. Kimetsu no Yaiba Episode 21

During their standoff, Shinobu famously teases Giyu, stating that nobody likes him—a moment fans often cite as a series highlight.

The episode opens with the final moments of Rui, the Lower Rank Five demon. The rest of the team—Inosuke and Zenitsu—are rescued

While Giyu holds Shinobu in a headlock, Kanao Tsuyuri pursues the siblings. Nezuko avoids her slashes by shrinking into a smaller, "adorable" form to escape. Aftermath and Cliffhanger

, titled "Against Corps Rules," serves as the emotional conclusion to the Natagumo Mountain Arc, balancing a tragic villain backstory with high-stakes tension between the Hashira . Rui’s Tragic Backstory In a rage, Rui killed them, believing their bond was fake

The conflict is halted by a Kasugai Crow delivering orders to take Tanjiro and Nezuko into custody.