Recaps

Senku recruited Kaseki to make glass bottles, while Chen Yu advised Senku about treating Ruri and let him continue pursuing the medicine needed to win over Ishigami Village. As Kinro and Ginro trained to stop Magma from marrying Ruri, Kinro refused Chen Yu’s offer of treatment.

• Senku baited the bound Kaseki with glasswork, and Kaseki broke free and began making bottles with skill.
• Kaseki and the others worked through the night to produce enough glass containers, and Chen Yu told Miwa that her dagger could be made.
• Senku asked whether herbal medicine could replace sulfonamide drugs, and Chen Yu said it might help Ruri but urged him to make the drug quickly.
• Over the next few days, Kaseki made containers while Kinro and Ginro trained and the group generated electricity.
• Chen Yu warned Kinro that his muscles were overworked, but Kinro refused treatment because he wanted to stop Magma from marrying Ruri.

Miwa remembered her loving childhood with her father and the killers who destroyed their home, fueling her long pursuit of revenge. After Chen Yu noticed her killing intent and unusual fighting stance, he disarmed and restrained her, then asked what was going on.

• Kaseki and Miwa completed an iron dagger, which brought Miwa to tears as she remembered her father.
• Young Miwa practiced with a dagger despite preferring to become a doctor, and her father reassured her that he would protect her.
• Miwa returned home to find her father badly wounded, and he hid her with a dagger while killers searched and burned down their house.
• Miwa entered an orphanage, later trained for revenge, and learned after her revival that she could bring her father back.
• Chen Yu noticed Miwa's killing intent, and Senku distracted her so Chen Yu could disarm and restrain her.
• Chen Yu asked Miwa what she was after and why she had hidden who she was.

Chen Yu used strange acupuncture techniques to make the captured Miwa talk. After he and Kaseki crafted fine needles and Chen Yu treated Kaseki, Miwa confessed to everything, though the chapter did not reveal what she said.

• Chen Yu tied up Miwa and tried to intimidate her with a bone needle, while Senku recognized that Chen Yu planned to have Kaseki build a sword box.
• Chen Yu convinced Kaseki to make the device in exchange for plans, and Senku warned that it could be devastating for their Stone Age civilization.
• Chen Yu, Kaseki, and Kohaku made seven iron needles and two silver needles, and Chen Yu used some to give Kaseki acupuncture treatments.
• Chen Yu inserted needles into Miwa, temporarily paralyzing her and then causing alternating cold and heat and dizziness until she agreed to talk.
• Chen Yu removed the needles, and Miwa gave a full account of everything.

Chen Yu demonstrated the Tube Spear Style and Return Horse Spear, then trained with Kohaku while Kinro studied the techniques. The next day, Kinro began imitating Chen Yu's moves during practice, while Chen Yu continued sparring with Kohaku.

• Miwa finished recounting her story, and Chen Yu argued against killing her because her disappearance would draw suspicion from the Tsukasa Empire.
• Chen Yu demonstrated Hyoga's Tube Spear Style with Ginro's spear and invited Kohaku to spar so Kinro could study the technique.
• Chen Yu used a Return Horse Spear to catch Kohaku off guard and knock her down, then asked Miwa whether she wanted revenge.
• The next day, Reiko and Miwa gathered medicinal herbs, Senku and Chrome researched, and Kaseki worked on Chen Yu's sword case.
• Kinro began imitating Chen Yu's spear techniques while training with Ginro, and Chen Yu continued knocking Kohaku down during their sparring.

Chen Yu taught Kohaku to hold a horse stance and tested a sword case Kaseki had forged, then demonstrated his swordsmanship to the others. He refused to take on a combat role, insisting he would remain support.

• Kohaku asked Chen Yu to teach her, and he had her hold a horse stance while Ginro tried to provoke her.
• Miwa asked about training, and Chen Yu told her she had already built her foundation before she returned to helping Reiko with herbs.
• Kaseki showed Chen Yu a sword case and three swords, and Chen Yu approved of his work and encouraged him to forge a sword of his own.
• Chen Yu tested the sword case, demonstrated his swordsmanship, and told Kohaku that close-quarters combat would suit her better than his sword techniques.
• Chrome wondered whether Chen Yu could handle Long-Haired Man or Hyoga, but Chen Yu declared he would only provide support and logistics.

Chen Yu rescued Ginro from a deadly lake and devised a way to collect its poisonous water. The group left with the water and planned to make gas masks so they would not have to depend on Chen Yu.

• Chen Yu hid the sword, learned that Senku and the others had gone to gather ingredients, and hurried after them with medical supplies.
• Chen Yu warned Kohaku to pull Ginro back from the lake, where birds dissolved in the water and Ginro had become trapped in a frightening illusion.
• Chen Yu examined Ginro and explained that the illusion had captivated him, then used acupuncture to calm him.
• Chen Yu protected himself with needles and collected the lake water in a glass bottle using a rope and a falling column of water.
• Chen Yu warned the others to stay away from the lake, while Senku said they needed to make gas masks; Kohaku and Chrome carried the sleeping Ginro back.

Chen Yu gathered poisonous gelsemium and processed it into Paralysis Powder, using Senku as an unwilling test subject. Senku woke furious and vowed to get revenge once he restored society.

• Chen Yu found gelsemium near Ishigami Village, dug up the plant, and brought it back despite Kohaku's warnings.
• Chen Yu processed the poisonous plant and dried it away from the work area after Senku and Chrome objected.
• Chen Yu gathered and ground herbs, then made a packet of Paralysis Powder the next day.
• Chen Yu sprinkled the powder on Senku, who lost sensation and slept until evening before realizing he had been used as a test subject.
• Senku confronted Chen Yu, but Chen Yu knocked him out; the next day, Kohaku and Chrome stopped Senku from retaliating, and Chen Yu worked for him for a day.

Chen Yu questioned his purpose in the Stone World, and Senku encouraged him to use his medical knowledge as part of a special action team. Chen Yu and Gen left to carry out their mission, while Ishigami Village prepared for its tournament.

• Gen asked Senku whether making Chen Yu work would harm his hands, and Senku pointed out Reiko and Miwa as other available helpers.
• Chen Yu tried to make a mold but gave up when the work proved beyond his skills.
• Chen Yu asked Senku whether reviving humanity still mattered and what purpose he had in the Stone World.
• Senku reminded Chen Yu that he had revived him to help keep Tsukasa in check and offered him the role of leader of a Biochemical Weapons Action Team.
• Chen Yu gave Gen a dagger and handed Senku his Paralysis Powder before he and Gen left on their mission.
• After Chen Yu and Gen left, Ishigami Village's tournament began.

Chen Yu returned to the Tsukasa Empire, cared for Xiao Xi, and prepared medicines while discussing the empire’s needs with Tsukasa. As they worked, Chen Yu explained why he wanted to pass down traditional Chinese medicine, while Senku entered the grand tournament in Ishigami Village.

• Chen Yu returned to the Tsukasa Empire, checked Xiao Xi’s recovery, and told her to rest.
• Chen Yu sorted and labeled herbs with Miwa and Reiko, then prepared medicinal powders for later use.
• Tsukasa told Chen Yu that Hyoga and the others had found the village at the foot of the mountain and planned to investigate it.
• Chen Yu asked Tsukasa about the empire’s population and urged him to assign people to help make warm clothing for winter.
• Chen Yu explained that he had focused on traditional Chinese medicine because it was easier to pass down, and Tsukasa silently resolved to help him preserve it.
• Senku entered the grand tournament in Ishigami Village as the others watched in astonishment.

Chen Yu organized preparations for the Tsukasa Empire’s future food supply while Hyoga took Gen to Ishigami Village, where Senku had become chief. At the Grand Bout, Magma fought to show how he had changed, and Senku defeated Ginro with a precise strike using Suika’s watermelon helmet.

• Chen Yu arranged for people to hunt and smoke meat, prepared land for farming, and planned to explore and map the changed landscape.
• Hyoga tried to abduct Miwa or Reiko, but Chen Yu caught the gymnast and punished her with Itching Powder before Hyoga took Gen to Ishigami Village.
• Magma entered the Grand Bout to prove he had changed, defeated Kinro through strength, and fought alongside Chrome for the chief’s position.
• Ginro misunderstood a rumor about Ruri and attacked Senku in earnest, alarming the villagers who feared he might become chief.
• Senku used Suika’s damaged watermelon helmet to trap Ginro’s staff and struck him down.

Senku won the village chief duel after Chrome fell asleep, but he rejected the marriage to Ruri so he could focus on making the Special Medicine. As Senku and Kohaku left to prepare it, Gen hurried to warn them that Hyoga was coming.

• Chrome fell asleep after exhausting himself in his contest with Magma, so the referee declared Senku the winner of the Imperial Duel.
• Senku agreed to marry Ruri, then learned that Chen Yu’s herbs had improved her health and that she no longer appeared critically ill.
• Kokuyo objected to Senku becoming chief, but Senku ignored him and demanded alcohol after the duel.
• Senku abruptly announced that he and Ruri should get divorced, then left with Kaseki to make the Special Medicine while Kohaku carried the alcohol and vinegar after them.
• Kinro and Ginro explained to Kokuyo what they had been doing, calming him, and Gen ran to warn Senku that Hyoga would soon arrive and that he had sabotaged Hyoga’s weapon.

Senku completed the medicine for Ruri, who recovered and became chief Senku’s link to a mystery about his name and Chen Yu. Far away, Chen Yu remembered a song and saw the faces of people from the space station, including a woman who sang.

• Gen helped Kaseki with experiments, then later found and drank the cola Senku had made.
• Senku, Chrome, and the others completed the medicine, and Kohaku brought it to Ruri.
• Senku examined Ruri and confirmed her illness had affected her lungs, while Ruri began coughing after taking the medicine.
• Ruri’s breathing improved, and she recovered enough to run; Kokuyo then announced Senku as Ishigami Village’s chief.
• Ruri told Senku that she had known his name, Senku Ishigami, and Chen Yu’s name since the distant past.
• Chen Yu remembered a lonely song and saw the faces of the people aboard Earth’s space station, including a woman who sang.

Chen Yu unexpectedly traveled to the space station during the petrification event and told Byakuya Ishigami and the others about humanity’s future. After the encounter vanished from everyone else’s memories, Chen Yu returned to his own time with Lillian’s song remembered, intending to share it with future generations.

• Chen Yu appeared on the space station, where Byakuya Ishigami and the others learned that Earth had been petrified.
• Chen Yu explained that he had come from 3,700 years in the future, described Senku’s work and their descendants, and told Byakuya that Senku was doing well.
• At Chen Yu’s request, Lillian sang, and Chen Yu memorized her song before telling the group about Ishigami Village and their descendants.
• Chen Yu disappeared, and everyone except Byakuya forgot meeting him; Byakuya wrote down the encounter and urged himself to remember Chen Yu.
• Chen Yu returned to his own time, remembered Lillian’s song, and ran down the mountain with Xiao Xi, Reiko, and Miwa to sing it for future generations.

Chen Yu and Reiko sang a song of hope that reached both the Tsukasa Empire and Ishigami Village, lifting the spirits of those who heard it. After returning safely to Tsukasa, Chen Yu wondered whether tomorrow would be better.

• Tsukasa learned that Chen Yu had left with the women and sent people after them, including a muscular blonde woman.
• Chen Yu brought Miwa, Xiao Xi, and Reiko to a hill and asked them to sing; he and Reiko performed a song inspired by Lillian.
• The people following Chen Yu were moved by the song, while Senku, Kohaku, Ruri, Suika, and Chrome heard it from Ishigami Village and felt hopeful.
• After Senku explained that he and Byakuya were not related by blood, Magma repeatedly jumped into the sea in frustration.
• Chen Yu returned to the Tsukasa Empire, where Tsukasa praised his singing and joined him for grilled meat.

Chen Yu treated a flood of patients in the Tsukasa Empire with medicinal herbs and acupuncture, then treated Tsukasa for a chill. The exhausted Reiko nearly poisoned herself by chewing on Pokeweed, and Chen Yu caught her in the act.

• After Chen Yu's song stirred up pent-up emotions, injured, ill, and sleepless people overwhelmed the Tsukasa Empire's four doctors.
• Chen Yu examined patients and directed Miwa, Reiko, and others to prepare herbal remedies for a range of ailments.
• Chen Yu treated patients through the day and into the night, using bone needles for acupuncture when herbs were unavailable.
• Tsukasa visited Chen Yu, who noticed he had caught a chill and made him drink a bowl of soup.
• Chen Yu discovered that sleeping Reiko was chewing on stored Pokeweed, snatched it from her, and scolded her.

Chen Yu treated Reiko after she was exposed to a dangerous substance, while Senku told the others about Chen Yu’s medical skills and a deadly poison he had once created. The group connected the poison to a Forbidden Zone and ended the conversation confident they could win with Chen Yu and Senku on their side.

• Chen Yu prepared medicine and treated Reiko with acupuncture after she dealt with the remaining toxins, then both of them went to sleep.
• Senku told Suika and the others that Chen Yu had been a brilliant medical scholar with extraordinary memory and precise control over his hands.
• Senku recalled that Chen Yu had developed a deadly poison but disposed of it because it was too dangerous.
• Ruri described a Forbidden Zone where nothing lived, and Kohaku recalled that her father had warned her not to go there.
• Senku warned the others to stay away from the Forbidden Zone and explained that he had left medicine to Chen Yu while focusing on scientific research.
• Kohaku asked whether they would win with Senku and Chen Yu, and Senku agreed that they would.

Chen Yu went to Ishigami Village to mark the anniversary of a flag-raising ceremony from his past life, then learned that Hyoga had attacked the village. After a few peaceful days, a group of people appeared at the village entrance.

• Chen Yu left Tsukasa to find Senku and confirm the date, promising he would return.
• Chen Yu learned it was October third and created a flower image on the ground before saluting west in remembrance of his homeland.
• Chen Yu recalled attending a flag-raising ceremony with his parents every year before the Stone World.
• Gen told Chen Yu that Hyoga had attacked, but Kinro had driven him back with the Return Horse Spear and a bluff about firearms.
• Chen Yu examined Kinro, stayed overnight in the village, and began teaching Kohaku martial arts the next morning.
• After a few peaceful days, a group of people appeared at the village entrance.

Chen Yu and the Ishigami Village fighters repelled Hyoga’s attack after Gen and Senku helped disable Hyoga’s spear. Hyoga revealed the battle was only a feint, but Chen Yu’s voice interrupted as Hyoga searched for the missing person who was meant to carry out the real plan.

• With the wind rendering Senku’s gunpowder useless, the Tsukasa Empire’s men charged, but villagers wielding iron cutting tools destroyed their weapons.
• Chen Yu prepared his custom spear while Kohaku, Kinro, and Magma fought Hyoga, whose spear techniques they had learned to counter.
• Gen pretended to betray the village, then admitted Hyoga had seen through the act as a gust of wind helped him escape.
• Hyoga’s spearhead fell off after its bandages were cleanly cut, and Senku praised Gen for using Chen Yu’s dagger.
• Hyoga’s group retreated after losing its main fighting power, but Hyoga warned that the battle had only been a feint.
• Senku and Hyoga looked toward the rear for the missing person, and Chen Yu asked whether Hyoga was looking for her.

Chen Yu stopped Hyoga’s attempt to set a fire, and Hyoga withdrew with the Pink-Haired Girl after Senku prevented the villagers from pursuing them. Back at Tsukasa’s camp, Hyoga branded Chen Yu a traitor, but Tsukasa refused to act against him; Chen Yu remained with Senku’s group and offered to train Magma, Kohaku, and Kinro.

• Chen Yu caught the Pink-Haired Girl before she could set a fire, then knocked Hyoga’s broken spear away when Hyoga tried to take his spear.
• Hyoga left with the Pink-Haired Girl and promised to meet Senku and Chen Yu again, while Senku stopped Kohaku and Magma from chasing them.
• Hyoga told Tsukasa that Gen and Chen Yu had betrayed them and warned that Reiko and Miwa might do the same, but Tsukasa refused to target their doctors.
• Tsukasa reassured Reiko that he would protect her and hoped Chen Yu would keep his word.
• Chen Yu explained spear technique to Kohaku, then learned that Senku was not Magma’s ancestor and offered to teach Magma, Kohaku, and Kinro how to fight.

Chen Yu trained Magma, Kohaku, and Kinro while he and Senku discussed the conflict with Tsukasa and the village’s preparations. Hyoga had given Tsukasa information about Ishigami Village, leaving both sides preparing for a coming decisive battle.

• Chen Yu trained Magma, Kohaku, and Kinro until dusk, then arranged food and medicinal herbs for Magma.
• Chen Yu told Senku that Magma had potential but still fell short of Tsukasa, and Senku said the Long-Distance Telephone was nearly finished.
• Chen Yu and Senku discussed how Chen Yu’s presence had changed events and agreed he would return to the Central Plains after the conflict ended.
• Senku said he knew only the general area of the old hospital, and Chen Yu dropped the subject.
• Hyoga had brought Tsukasa information about Ishigami Village, while Chen Yu considered how both sides could prepare for the approaching decisive battle.

Ukyo stopped Hongye Yan from targeting the three girls in the Medicine Room, while Chen Yu reassured Kohaku that his allies were protected. Chen Yu and Kaseki then completed their experiments and made paper, leaving the group with a new invention to develop.

• Hongye Yan watched the three girls in the Medicine Room until Ukyo confronted her and drove her away.
• Miwa put down the anesthetic she had prepared after sensing that Hongye Yan and Ukyo had left.
• Chen Yu explained to Kohaku that Miwa and Ukyo would protect the girls, and described how Taiju had endured his medicinal experiments.
• Taiju chopped trees to build a warm house for Yuzuriha, while Senku and Chen Yu traded jokes before returning to work on the telephone.
• Chen Yu shared an idea with Kaseki, and the two experimented with materials until they successfully made paper.

The author addressed reader comments about Stone World’s arcs, characters, plot, and the author’s personal circumstances. The chapter ended with the author defending Chen Yu’s scientific abilities and expressing frustration over criticism about traditional Chinese medicine and rocketry.

• The author outlined their interpretation of Stone World’s arcs and promised that Chen Yu would eventually resurrect his parents.
• The author discussed reader comments, character influences, Chen Yu’s abilities, and the profiles of Shiraishi Koki, Suzuki Reiko, and Kitano Miwa.
• The author described their health problems, accident, writing process, and earnings, and mentioned being surprised by readers’ concern for their wellbeing.
• The author said they had obtained Welt, Kafka, and Himeko in Honkai: Star Rail, then challenged criticism that Chen Yu should not study traditional Chinese medicine while pursuing rocketry.
• The author explained that Senku’s interest in science began with the moon seeming to follow him, not with medicine, and said the criticism had angered them.

Chen Yu and Senku discussed the new paper, and Senku proposed using grass fibers to make protective shields against Tsukasa’s people. Chen Yu’s woodworking skill impressed Senku and offered to help with the shield, leaving Kokuyo and the others speechless.

• Senku asked Chen Yu how much paper they could make, and Chen Yu said they could produce a few hundred sheets but could not make ink.
• Senku asked Ruri to gather grass so they could test making paper for shields, then returned to work on the telephone.
• Chen Yu assigned Kaseki to continue making paper and took Kinro and Ginro to collect iron sand while planning protective gear.
• Chen Yu carved a precise wooden gear for Senku after finding him arguing over an unsuitable part.
• Senku praised Chen Yu’s craftsmanship and asked him to make the items Kaseki had been meant to produce, prompting Chen Yu to point out Kohaku’s shield.

Chen Yu woke in a hospital after collapsing and gradually weakened until he died, whereupon he saw Him. The rest of the chapter was an author’s note about corrections, the story’s direction, and the author’s health.

• Chen Yu regained consciousness in a hospital and learned from his mother that he had suddenly fainted.
• Chen Yu’s condition worsened over time until he could no longer walk and became bedridden.
• Chen Yu died when the ECG monitor flatlined and saw Him.
• The author discussed story corrections and plot inconsistencies, then described ongoing heart concerns and uncertainty about future updates.

Chen Yu and Kokuyo reflected on Senku’s future as the village prepared for battle, while Chen Yu’s concern about overwork became clear when he treated an exhausted Chrome. Senku ordered everyone to balance work with rest, and the villagers resumed their preparations while Chrome slept.

• Chen Yu spoke with Kokuyo before dawn, and Kokuyo voiced his resentment over Senku divorcing Ruri while Chen Yu predicted Senku would accomplish something world-changing.
• The villagers worked on battle preparations as Chen Yu trained Kohaku, Magma exercised, Kaseki made paper, and Gen helped twist wire for the centrifuge.
• Chrome returned after three days away in a severely exhausted state, and Chen Yu treated him before leaving in a bad mood.
• Senku told the villagers to work within their available time and rest properly, explaining that Chen Yu had once forced him to sleep when he overworked himself.
• Chrome fell asleep, so Senku told the others to prepare food and water for him before they returned to work.