Chapter Summaries

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.