Ruri (ルリ) is a descendant of modern day humans. She is Kohaku's older sister and the daughter of Kokuyo, and serves as the priestess in Ishigami Village.


Ruri is a young woman with a delicate face, long blond hair, and green eyes. She appears to have a mix of Japanese and American descent, denoting her heritage as a descendant of Byakuya Ishigami and Lillian Weinberg. She shares similar facial features with her younger sister Kohaku, but has longer, manageable hair and a more curvy, hourglass-shaped figure; Ginro crudely pointed out that Ruri has bigger breasts than Kohaku.

She wears a primitively made purple sundress and a rope around her neck. When Yuzuriha built a fashion store, Ruri wore a modern outfit.[2]



Ruri is a kind, gentle and demure young woman with a submissive personality, as she was fine with marrying whoever won the village tournament. This was perhaps due to her illness and frailty; she was resigned to her fate of a short life.

When she learned of Senku's presence in the village, she showed curiosity and a keen memory, his name managing to stir up memories of one of Ishigami Village's stories.

After making a full recovery from her illness, Ruri is shown to be more optimistic and positive and even shows a more tomboyish side, immediately making a full dash running around the village. Despite this, she is still much more feminine than Kohaku.


Ruri may share some of Kohaku's athletic prowess, as her first instinct when she is cured is to sprint off into a field at high speeds.

She is very observant, as she was able to tell Kohaku was in a dangerous situation, simply because her hair knot was different, something most wouldn't have noticed.


Ruri was born to the village chief in Ishigami Village at some point in time. During her childhood, Ruri would hear tales of Senku Ishigami and how he is meant to save the village.

She eventually became extremely sick around her 18th birthday. Kohaku managed to sustain her life using hot water that she gathered every day to slow down the progression of her illness.


Kingdom of Science Arc

She notices Kohaku's hair knot was different and questions what danger she faced that made her change her knot.

Village Games Arc

After Senku won the Village tournament by accident (he was supposed to surrender to Chrome, who fainted from his last match), he was crowned chief. Senku immediately married Ruri, who blushed at his quick acceptance. She is shocked they divorced almost immediately afterward but her sister assures her its his way to discover her illness.

After Senku diagnosed Ruri with pneumonia, she was willing to take the risk of modern-day medicine, consuming antibiotics for the first time. Eventually, she made a full recovery after the treatment. With her health restored, Ruri made a full dash through the village, leaving the village surprised before they realized she truly is healthy.

Village Origins Arc

When Senku discovers the village has his last name, Ruri approached him after seeing his confusion. Ruri reveals that Ishigami Village was founded by Byakuya Ishigami and his crew, and Senku Ishigami is widely famous amongst the village community throughout every generation, as Ruri fully remembered her mother’s story about Senku’s legend. Her explanation cause Senku to understand why there are still humans around.

She shows Senku his father's grave and leaves him to have a moment after he asks her.

Vs. Hyoga Arc

When Homura Momiji set the village ablaze, Ruri told the worried Jasper and Turquoise to forget her and protect the children.

Communications Arc

Ruri is present when Senku creates cotton candy and is amazed by the taste.

She aids Gen in making batteries.

When the phone is complete the village tried to encourage Chrome to confess to Ruri, though he instead compliments the usage of a phone to her, as she smiles at this. After comparing Senku's phone to a bee and telling him a tale about a bee communicating with the dead, he realizes that Byakuya left a recording message for him.

Once the record player is made, Ruri is amazed by hearing the recording of Senku's father and the song by Lillian Weinberg.

Age of Exploration Arc

Ruri is encouraged by Ginro to confess to Chrome, as she blushes at the notion and tries to go through with it but fails because of the loss of Signal.

Treasure Island Arc

Senku previously asked Ruri about the 100 tales and she bores him with most of them. Very soon, she tells him about the islanders where the founders originally landed.

Ruri is amazed to see Ginro jump into the ocean, despite previously refusing to go.

After the conflict on Treasure Island is done, Ruri soon contacts Senku and he updates her.

New America City Arc

Ruri is happy when the Perseus returns and to see that the modern people have lost their scars, meaning they found the secret of Petrification. After Tsukasa is revived, she watches Minami choose to let him reunite with his sister first but Ruri pushed her into talking to him, while Nikki notes on Ruri's assertive nature.[3]


  • Her name Ruri is the Japanese word for Lapis Lazuli. It is a type of metamorphic rock.
  • She appears to be rather popular as Chrome, Magma, Ginro, and Kinro have all shown an attraction towards her though she married Senku (for barely a day before he divorced her due to his lack of interest in romance).
    • Chrome's feelings are the most sincere and genuine and it is implied later chapters that she in fact reciprocates his feelings.
      • Since the Grand Bout has likely been abolished by Senku, the chance of them ending up together is very certain.
    • Magma only wanted to marry her in order to become the new village chief and was even planning to kill her if her illness did not.
    • Ginro lusted after her, quite obviously.
    • Kinro likely had more noble motives, believing in the rules as he does.
  • Her illness was initially unknown. Senku deduced based on how her lungs sounded that she had water in her lungs. After dissecting a rat, he further diagnosed that the inflamation in her lungs was caused by bacteria passed from rats. After Senku made an antibiotic (sulfanilamide) to cure her illness and she had an averse reaction where the bacteria started to act up as the number of infectious bacteria increased, he deduced she was infected with Streptococcus pneumoniae, which has the ability to hijack surrounding harmless bacteria with their own toxic genes to multiply the number of infectious bacteria in the body. In other words, the name of her disease was pneumonia.[4]


  1. 1.0 1.1 Dr. Stone Manga; Volume 4, Q&A Section
  2. Dr. Stone Manga: Chapter 87
  3. Dr. Stone Manga: Chapter 141
  4. Dr. Stone Manga: Chapter 41

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