“ | Be strong, Master!! Hurry up and give the next order!! The fight isn't over yet!! |
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— Kuina to Kiriya Ubuyashiki in Disaster
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Kuina Ubuyashiki (
Appearance[]
Kuina has features similar to the rest of her family, light, pale skin with a set of large eyes. She wears a white blunt bob with fringe covering her eyes.
Kuina is usually seen wearing a purple, flower-patterned Edo komon kimono with a white juban under it. She also wears a black obi with a white obiage under it and a pink obijime it.
Personality[]
Kuina displays her strong sense of loyalty and devotion to her brother as the new head of the Ubuyashiki Family and leader of the Demon Slayer Corps, by being the one to forcefully remind him of his duties as their leader. She even resorts to physical force to remind him of this by slapping him, in order to ensure he did not break down under the stress of his responsibilities.[3]
History[]
Kuina was born into the Ubuyashiki family as one of the quintuplets. She is one of the youngest children in the family.
Synopsis[]
Hashira Training Arc[]

Kuina by her brother's side as he is made Kagaya's successor.
Kuina's parents devised a plan to set up an ambush for Muzan Kibutsuji, which involved blowing up their mansion with them in it. Kuina's two elder sisters: Nichika and Hinaki chose to stay and die with their parents, while she and Kanata were set to assist their brother Kiriya, who would finally remove his girl's clothing and assume the position of Oyakata. They would be relocated to the hidden Butterfly Mansion, with retired Hashira Tengen Uzui and Shinjuro Rengoku serving as their bodyguards, a first time in generations for the family.
Infinity Castle Arc[]

Kuina slaps Kiriya.
Using talisman created by the allied demon Yushiro, Kuina helps her brother and sister draw a map of the Infinity Fortress; she sat to the right of left of him. [4] During the battle against Upper Rank One Kokushibo, a crow surveilled the battle and the siblings watched it via Yushiro's Blood Demon Art. Kuina asks Kiriya if they should send other slayers, specifically Tanjiro and Giyu, to fight Kokushibo and waits for his response. Kiriya denies, stating that they will keep heading towards Muzan, confident that Sanemi, Gyomei, Muichiro, and Genya will emerge victorious. [5]
Much later, Kuina informs Kiriya that a batch of Demon Slayer were arriving to Muzan's location before Kanata adds that a second batch was coming, much to his worry. Muzan then goes on a rampage slaughtering countless Demon Slayers, causing Kiriya to have a nervous breakdown.[6] Unresponsive to his sisters calling to him, Kuina slaps Kiriya across the cheek. After she reels back the from the shock of her action, Kuina yells at her brother to get a hold of himself as the fight had not yet ended. Kiriya composes himself and thanks his sisters, causing them both to cry.[7] Kuina would later feel regret at slapping her brother.[8]
Sunrise Countdown Arc[]
After Tanjiro, Giyu, Mitsuri, and Obanai begin to clash with Muzan, he realizes that Yushiro had taken control of Nakime and kills her in a panic, causing the Infinity Castle to collapse and rise the surface, with only an hour and a half until dawn, much the the worry of the siblings.[9]
Later on, when Nezuko Kamado is awoken by the spirit of her father warning her of Tanjiro's peril, she flees from the Butterfly Mansion. Kiriya initially orders for her to be chased down before immediately taking it back. much to the confusion of his sisters. Kiriya then tearfully explains that it was Kagaya's request that they leave Nezuko be.[10]
During the fight against Muzan, the King of Demons was backed into a corner and unleashed a mighty shockwave so powerful that it killed Kasugai Crows, which even injured the Ubuyashiki siblings. Remaining strong while her brother and sister were aided by Shinjuro and Tengen respectively, Kuina listened as Kanata stated that although she couldn't see the battle anymore because the talisman were displaced but dawn was a mere 25 minutes away. [11] Sure enough, sunrise eventually came and Muzan finally succumbed to the sunlight. Due to Yushiro's talisman burning in the sunlight, Kuina was unaware about the brief struggle against a temporarily demonized Tanjiro.

Kuina crying after Giyu tells Kiriya that his father would be proud.
Kiriya and his sisters would summon the only surviving Hashira, Giyu and Sanemi, for a final Hashira meeting; he officially disbanded the Demon Slayer Corps due to the demonic threat finally being annihilated. The siblings profoundly thank the Wind and Water Hashira for their efforts, before they exclaim that they don't need their gratitude as the Ubuyashiki family were the real reason the Corps survived as long as he did. Giyu praises Kiriya for his leadership and says that his father and ancestors would be very proud of him causing all three children to become overwhelmed with emotion and cry.[12]
After Muzan's death, the Ubuyashiki curse would finally end with Kiriya, who realized this when he aged into his 20s and 30s. He spends his hours weeping and holding his wife, children, and surviving sisters.
Abilities[]
Extraordinary Memory: During the infiltration of the Infinity Castle by the Demon Slayer Corps, Kuina displays exceptional memory and skill in map making, having successfully mapped out and memorized the entire structure, despite the castle constantly changing. She also provides real-time logistical information to the Hashira alongside her sister, aiding her brother in planning the route to Muzan Kibutsuji's location.
Trivia[]
- Kuina was the last member of the Ubuyashiki Household revealed.
- She has good physical abilities, as evidenced by her slapping of Kiriya.[8]
- She is bold and doesn't mind insects, and can touch them with her bare hands.[8]
- In Kimetsu Academy, Kuina was described as the 'mischievous' one of the Ubuyashiki quintuplets.
Relatives[]
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| Kagaya |
| Amane |
| Senri |
| Akito | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Hinaki |
| Nichika |
| Kiriya |
| Spouse |
| Kuina |
| Kanata | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Quotes[]
- (To Kiriya Ubuyashiki) "Be strong, Master!! Hurry up and give the next order!! The fight isn't over yet!!"[13]
References[]
- ↑ Kimetsu no Yaiba Manga: Chapter 144 (Page 6).
- ↑ Kimetsu no Yaiba Second Fanbook.
- ↑ Kimetsu no Yaiba Manga: Chapter 181 (Pages 1-4).
- ↑ Kimetsu no Yaiba Manga: Chapter 144 (Pages 5-8).
- ↑ Kimetsu no Yaiba Manga: Chapter 172 (Pages 4-5).
- ↑ Kimetsu no Yaiba Manga: Chapter 144.
- ↑ Kimetsu no Yaiba Manga: Chapter 181 (Pages 1-5).
- ↑ 8.0 8.1 8.2 Kimetsu no Yaiba Manga: Volume 21, (Extra Pages).
- ↑ Kimetsu no Yaiba Manga: Chapter 184 (Pages 2).
- ↑ Kimetsu no Yaiba Manga: Chapter 185 (Pages 4-6).
- ↑ Kimetsu no Yaiba Manga: Chapter 197 (Pages 6-7).
- ↑ Kimetsu no Yaiba Manga: Chapter 204 (Pages 7-11).
- ↑ Kimetsu no Yaiba Manga: Chapter 181 (Page 4).