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 more modern dress.[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.[3]

She notices something off with Kohaku and concludes some accident must've happened. She then pleads Kohaku not to push herself for her own sake, showing that she cares much about her sister's well being despite her own health in a rapidly deteorating.

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.

She also displays a more assertive side, at one point shoving Minami towards Tsukasa so she could join the happy reunuin, despite Minami's initial hesitation as she felt Mirai (as Tsukasa's biological sister) had precedence.


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 is introduced as the village priestess. As Kohaku brings her water she is questioned for the number of barrels she's brought. Kohaku simply responds with falling asleep and not paying attention, as she is berated by Jasper and Turquoise on her clumsiness. Ruri then requests the two leave the sisters alone. The two refuse, saying they can't leave the priestess on her own - to which Ruri pleads by bowing. As the two finally leave, Ruri scolds Kohaku since she deduces something must've happened that Kohaku's hair knot fell over. She then tells Kohaku to not push herself so much for her sake, since she's destined to die soon anyway.[3]

Village Games Arc

Once Senku finally steps foot into the village, Ruri recalls his name being familiar.[4] She approaches Senku and asks what his family name is, most villagers not knowing what that means. When she mutters the first few letters of Senku's surname, she collapses, weakened from her disease.[5]

Ruri is relieved to see Chrome win the battle against Magma. Ginro takes note that he is aware Ruri wants Chrome to win and that she shouldn't worry as Senku will surrender the match. Out of respect for her position, the priestess states that she doesn't possess such desires and that since this is a divine festival, she will accept whomever wins the competition. A confused Ginro then wrongly concludes that she is indeed fine with any winner and maniacally attacks Senku, only to be defeated and thrown out of the competition. Senku them moves into the finals, where Chrome faints due to his previous fight with Magma, thereby making Senku the winner, much to Ruri's shock.[6]

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.[7] After swallowing the antibiotic Senku gave her, she is inspected by the latter who concludes there is a fluid buildup in her lungs. A little while later, her condition suddenly turns to worse, with Jasper commenting that he has never seen her in such a worsened state. Kokuyo blames Senku on her current condition and grabs him. Senku agrees that the sulfa drug could have caused her to get sicker; shocking the group at first. However, he goes on to explain that the targeted bacteria is mobilizing more reinforcements now that it's existence is threatened, a special ability of streptococcus pneumoniae.

Senku declares victory over the pathogen as the drug they make treats the disease. Ruri's father frustratingly attacks Senku again, only to be stopped by Kohaku who states she believes in science and in Senku. The rest of the group nods in unison. After taking continuous doses of the drug, Ruri eventually overcomes the disease, being able to walk normally again. Kokuyo and Kohaku cry tears of happiness as Ruri celebrates her recovery by running, having forgotten the last time she stepped out of the village or was active at all.[8]

Village Origins Arc

Once Kokuyo accepts Senku as the new village chief, the latter comes to know the name of the village being Ishigami. He is then approached by Ruri who informs Senku she's always known his full name - that being Senku Ishigami.[8] 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 - a part of the hundred tales passed throughout the village's generations.[9] Her explanation causes Senku to understand why there are still humans around.

As she tells Chrome, Kohaku and Senku about a part of a hundred tales, she leads Senku to his father's grave, letting him know of the last part of the story - the one Byakuya intended for his son only. Once she conveys the tale, she leaves Senku alone at his father's grave while shedding a tear herself.[10]

Vs. Hyoga Arc

When Homura Momiji sets the village ablaze, Ruri tells the worried Jasper and Turquoise to forget her and rescue the children.[11] She enjoys the wonders of a new sweet called cotton candy made by Senku along with her sister. As Senku goads Homura into trying the candy, Ruri recognizes that Senku didn't offer her such pleasure purely for strategic purposes, but also for comfort as she was spying on them all alone for exceedingly long periods of time.[12]

Communications Arc

Ruri is present when Senku creates cotton candy and is amazed by the taste.[13] She aids in making batteries and is seen helping create wine.[14]

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.[15]


  • 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 (or at least an interest in marrying 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.[8]


  1. 1.0 1.1 Dr. Stone Manga; Volume 4, Q&A Section
  2. Dr. Stone Manga: Chapter 87
  3. 3.0 3.1 Dr. Stone Manga: Chapter 19
  4. Dr. Stone Manga: Chapter 33
  5. Dr. Stone Manga: Chapter 34
  6. Dr. Stone Manga: Chapter 39
  7. Dr. Stone Manga: Chapter 40
  8. 8.0 8.1 8.2 Dr. Stone Manga: Chapter 41
  9. Dr. Stone Manga: Chapter 42
  10. Dr. Stone Manga: Chapter 45
  11. Dr. Stone Manga: Chapter 49
  12. Dr. Stone Manga: Chapter 51
  13. Dr. Stone Manga: Chapter 52
  14. Dr. Stone Manga: Chapter 53
  15. Dr. Stone Manga: Chapter 141

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