Kimetsu no Yaiba Wiki
Kimetsu no Yaiba Wiki

It is the obligation of those born strong to defend the weak. Your mission requires you to fulfill your mission properly. Don't ever forget that.
Ruka Rengoku to Kyojuro Rengoku, Chapter 64

Ruka Rengoku ( (れん) (ごく) () () Rengoku Ruka?)[1] was the wife of Shinjuro Rengoku, and mother of Kyojuro Rengoku and Senjuro Rengoku.


Ruka has defined facial features, such as her sharp nose and long eyebrows. She has large dark red eyes with circular white pupils, similar in appearance to the Kamado family, and a small mouth, with semi-long black hair tied loosely at the end in a ponytail.

She is only seen wearing a traditional kimono in a series of flashbacks.


As opposed to her husband Shinjuro's loud personality, Ruka is depicted as being wise, gentle and graceful. In the manga, she is seen having strong morale values, teaching Kyojuro the importance of his life and the need to use his strength in order to protect the weak and helpless people in the world as his primal duty.[2]

Later, her husband speculated that their two sons have wonderful personalities mainly because of her biological influence.


Ruka is the mother of both Senjuro and Kyojuro, and is the wife of Shinjuro. Some time after giving birth to Senjuro, she developed an untreatable disease and was left bedridden up until her death.


Mugen Train Arc

Abilities and Powers

As an ordinary human, she doesn't possess any additional supernatural powers or abilities.


  • Ruka's given name contains the kanji for "lapis lazuli" ( () ru?) and "fire" ( () ka?).


  • (To Kyojuro Rengoku) "People who were born and blessed with greater abilities than others, have to use their power for the world, for the people. Hurting others with your power which was gifted from the heavens, and soiling your clothes is unforgivable. I will not be alive for much longer. It was a blessing to become the mother of such a strong, gentle child."
  • (To Kyojuro Rengoku) "The Rengoku Family has been slaying Demons for generations. The alias of the Flame Hashira is the pride of our family. Now, set your eyes on becoming a wonderful Hashira like your father. You have a flame in your soul. Burn those evil demons to a crisp. Kindly shine your light on people and keep that sun-like flame in your heart. Become the Flame Hashira."[3]
  • (To Kyojuro before his death) "You did a wonderful job."[4]


  1. Kimetsu no Yaiba Manga: Chapter 81 (Page 3).
  2. Kimetsu no Yaiba Manga: Chapter 64 (Page 13).
  3. Kimetsu no Yaiba Gakuen: Kyojuro Rengoku: Gaiden (Part 1)
  4. Kimetsu no Yaiba Manga: Chapter 66 (Page 8).