Ruka Rengoku | Demon Slayer Kimetsu No Yaiba

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It is the obligation of those born strong to defend the weak. Your mission requires you to complete it correctly. Never forget it.

Ruka Rengoku to Kyojuro Rengoku, Chapter 64

Ruka Rengoku (煉れん獄ごく 瑠る火か Rengoku Ruka?)[1] was the wife of Shinjuro Rengoku, and the mother of Kyojuro Rengoku and Senjuro Rengoku.

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Ruka has well-defined facial features, such as her pointed nose and long eyebrows. She has large dark red eyes with circular white pupils, similar to those of the Kamado family, and a small mouth. Her shoulder-length black hair is tied loosely at the end in a ponytail.

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


Unlike her husband Shinjuro’s boisterous personality, Ruka is portrayed as wise, gentle, and graceful. In the manga, she is seen to have strong moral values, teaching Kyojuro the importance of her life and the need to use her strength to protect the weak and helpless people in the world as her primary duty.

Later, her husband speculated that their two sons have wonderful personalities mainly due to his biological influence.


Ruka is Senjuro and Kyojuro’s mother, and Shinjuro’s wife. Some time after giving birth to Senjuro, she developed an incurable disease and was bedridden until her death.


Infinity Train Arc

Abilities and Powers

As an ordinary human, she possesses no additional supernatural powers or abilities.

Ruka anime 1


  • Ruka’s first name contains the kanji for “lapis lazuli” (瑠る ru?) and “fire” (火か ka?).


  • (To Kyojuro Rengoku) “People who are born and blessed with greater abilities than others, must use their power for the world, for people. Hurting others with your heaven-given power, and soiling your clothes is unforgivable. I won’t be alive for very long. It was a blessing to become the mother of such a strong and sweet child. »
  • (To Kyojuro Rengoku) “The Rengoku family has been killing demons for generations. The Hashira Flame alias is the pride of our family. Now set your goal to become a wonderful Hashira like your father. You have a flame in your soul. Burn those evil demons until they get crispy. Shine your light on people and keep that sun-like flame in your heart. Become the Hashira of the flame. »
  • (To Kyojuro before his death) “You did a wonderful job. »