Chapter Summaries

Suzuki Maika learned from Okubo Ryoya’s diary that her sister Suzuki Kimie had been abandoned during the yacht-club shipwreck rather than sacrificing herself, and she left determined not to forgive the survivors. On a secluded beach, Yukako encountered what appeared to be Kimie’s mermaid form asking why they had abandoned her.

• Suzuki Maika met Okubo Ryoya’s father, who told her Ryoya had died by suicide and gave her his diary.
• Suzuki Maika read that the yacht trip had not been her sister’s idea and that the other survivors had left Kimie behind.
• Suzuki Maika rejected the father’s plea for forgiveness and decided she would never forgive the surviving club members.
• Suzuki Maika spotted Yukako on a secluded beach and considered testing whether the diary’s claims were true.
• Yukako waited for Shimazaki and feared that Kimie’s mermaid curse had returned to haunt the survivors.
• A mermaid resembling Suzuki Kimie emerged from Wakasa Bay and asked Yukako why they had abandoned her.

Suzuki Maika drowned Yukako after learning she had helped abandon Suzuki Kimie, then hid Yukako in a seaside cave and planned to kill Shimazaki Daiki and the other survivors. Uchiha Naruto revived and persuaded Suzuki Kimie to cooperate with him, while Yukako woke to find herself at their mercy and Naruto sent a threatening message to the remaining yacht-club survivors.

• Suzuki Maika drowned Yukako, lost her mermaid contact lens, and decided to take revenge on Shimazaki Daiki and the other yacht-club survivors.
• Suzuki Maika hid Yukako's body in a seaside cave, unaware that Yukako's finger had twitched.
• Uchiha Naruto entered the cave, revived Suzuki Kimie, and used his Sharingan to restrain and study her.
• Uchiha Naruto persuaded Suzuki Kimie to become his summoning beast and cooperate with his jinchūriki experiments by promising her a chance to avenge herself and protect Suzuki Maika.
• Yukako woke and tried to call Shimazaki Daiki, but Suzuki Kimie's tentacle took her phone before she could act.
• Uchiha Naruto opened Yukako's LINE group and sent the survivors the message, “The mermaid's judgment will descend swiftly!”

Suzuki Kimie’s ghost returned to punish the Yacht Club members who had abandoned her, killing Yamamoto Tokuo and Haga Ryuji after Shimazaki Daiki revealed that Suzuki’s sister had come back to Obama City. The chapter ended with Haga drowned in his bathtub while Shimazaki remained unaware of the danger.

• Shimazaki Daiki told Haga Ryuji and Yamamoto Tokuo that Suzuki’s younger sister had returned, and Haga agreed to follow her during the Mermaid Festival for extra money.
• Shimazaki revealed that he had stood Yukako up at Conch Beach, and Yamamoto rushed out to find her.
• Yamamoto found a drenched woman he believed was Yukako, but she held him underwater and identified herself as Suzuki Kimie before a wave swept them away.
• Haga saw Yukako’s ominous message in the Yacht Club group chat, then found Suzuki Kimie emerging from his bathtub.
• Suzuki Kimie dragged Haga into the tub with her tentacles, and he drowned.

Shimazaki Daiki learned that four survivors of a yacht disaster had drowned, and he feared the mermaid’s curse was behind the deaths. As the police began investigating, a Metropolitan Police Department envoy took control and questioned Sakaki Namiru about her connection to Superintendent Uchiha.

• Shimazaki Daiki arrived late at the police station and learned that his girlfriend Yukako and Yacht Club member Yamamoto had drowned together at Conch Beach.
• Shimazaki Daiki found Yukako’s final message about the mermaid’s judgment and worried that Haga Ryuji had also died.
• Chief Shimazaki learned that Haga Ryuji and another Yacht Club member, Aki, had drowned in apparent homicides, and ordered Officer Yamashiro to bring Suzuki Maika in for questioning.
• Investigator Grace arrived with suited men and took control of the investigation on behalf of the Metropolitan Police Department Public Security Bureau.
• Sakaki Namiru protested that Maika could not be a suspect because she had been with her, but an officer detained her because she lacked an alibi.
• Investigator Grace asked Sakaki Namiru what her relationship was to Superintendent Uchiha after Sakaki invoked her brother-in-law.

Suzuki Maika was questioned after the Mermaid's Judgment killings but denied involvement, while Grace kept her detained and clashed with Sakaki Namiru. Uchiha Naruto left the police station with the miniature Suzuki Kimie and planned to force the authorities to release Maika.

• Suzuki Maika explained away the kitchen knife in her bag and broke down after learning that Yukako, Haga Ryuji, Yamamoto Tokuo, and Aki had died, while the police noted she had an alibi.
• Grace introduced herself to Uchiha Naruto and argued with Sakaki Namiru, who grew suspicious that Grace was interested in her brother-in-law.
• Grace told Sakaki Namiru that Suzuki Maika would remain detained for up to forty-eight hours and warned that Obama City's Mermaid Festival might be its last.
• Sakaki Namiru stayed at the station to wait for Maika, while Uchiha Naruto left to attend the festival.
• Uchiha Naruto revealed the miniature Suzuki Kimie in the restroom and said he would use force if necessary to make the authorities release Maika.

Uchiha Naruto discovered that Suzuki Kimie could shape her ink into lifelike creatures and a human figure, then visited Obama City’s Mermaid Festival. At the police station, Grace and the officers faced an invasion of strange, legged fish.

• Uchiha Naruto teased Suzuki Kimie and learned that her ink could form marine creatures and a near-perfect, if foolish-looking, copy of him.
• Uchiha Naruto left the station, watched the Mermaid Festival procession, and saw the fake mermaid mummy carried through Mackerel Main Street.
• Grace reviewed the Fifth Division’s suspicions that Suzuki Kimie was taking revenge on those who had abandoned her during the storm years earlier.
• Grace heard cries from the corridor, drew her gun, and found strange fish with slender legs crawling through the police station.

Sakaki Namiru discovered fish with strange legs inside the Obama City Police Station, but Officer Yamashiro dismissed her claims until a swarm invaded. Grace and the others fought back, and the chapter ended as a three-meter great white shark charged them through the rising black liquid.

• Sakaki Namiru crushed a strange fish beneath her shoe, but its legs vanished before Officer Yamashiro could see them.
• Sakaki Namiru blamed the fish on radioactive contamination in Wakasa Bay, and Officer Yamashiro tried to drive her from the station.
• A swarm of walking fish entered the station, and Sakaki Namiru warned Grace as Grace shot one of them.
• Grace noticed the fish did not attack people and ordered the Fifth Division agents to hold their fire, but the agents and officers began smashing the fish.
• Grace saw the dead fish's black legs turn into ink as the liquid rose above their ankles.
• A three-meter great white shark charged the group with its mouth open.

Grace and the police fought off an army of Land-Walking Fish, but Suzuki Kimie used their ink-like remains to create a flooded path into the holding cells and seize Shimazaki Daiki. Grace tried to negotiate by bringing in Suzuki Maika, but Chief Shimazaki arrived holding Maika hostage and declaring he would save his son.

• Grace ordered the officers to capture Land-Walking Fish alive, then led them outside to confront a much larger army with armed teams and flamethrowers.
• Grace realized the dead fish's ink was creating terrain for Suzuki Kimie and hurried back to the holding cells.
• Grace found Suzuki Kimie holding Shimazaki Daiki captive and offered to help her obtain revenge or a lawful trial.
• Grace ordered an agent to bring Suzuki Maika, hoping her sister could persuade Suzuki Kimie to cooperate.
• Chief Shimazaki forced his way in with Suzuki Maika at gunpoint and said he was saving his son.

Chief Shimazaki took Suzuki Maika hostage to force Suzuki Kimie to release his son, but Maika was shot and Suzuki Kimie went berserk. As Suzuki Kimie slaughtered Sailfish Squad, Grace was wounded and a mysterious figure arrived to save her.

• Chief Shimazaki entered the detention room with Suzuki Maika held at gunpoint, demanding that Suzuki Kimie release Shimazaki Daiki and provide him with a helicopter.
• Suzuki Maika bit Chief Shimazaki and tried to escape, but he accidentally shot her in the throat; Suzuki Kimie transformed in grief and killed the Shimazakis with a black blast.
• Grace tried to persuade Suzuki Kimie that Suzuki Maika could still be saved, but Sailfish Squad opened fire and Suzuki Kimie answered with devastating black beams.
• Grace ordered a retreat as Suzuki Kimie overwhelmed Sailfish Squad, then an octopus tentacle pierced Grace's abdomen.
• An unidentified figure severed the tentacle with a bare hand and rescued Grace.

The author reflected on struggling to gain readers and nearly giving up, then described how reader support carried the book through recommendations and into paid chapters. After meeting the goal of collecting three months of full-attendance bonuses, the author set a new goal of writing one million characters.

• The author said the manuscript had only 500 bookmarks at 100,000 Chinese characters, leaving them discouraged and doubtful.
• The author searched rookie authors' records and found two books with similarly weak early results that later reached the top ten of the rookie rankings.
• The author kept writing while hoping for an algorithmic recommendation at 100,000 characters and aiming to collect three months of full-attendance bonuses.
• The book received a trial recommendation at 120,000 characters, passed through four recommendation rounds, and went paid at 240,000 characters.
• The author thanked readers for their support, confirmed the first-stage goal was complete, and set a new goal of writing one million characters.

Kabuto Yakushi arrived at the Obama City Police Station, healed Grace, and subdued the berserk Suzuki Kimie while rescuing Suzuki Maika. After giving Maika a potent medicine, he revealed that he had come to the Human World in search of the mythical elixir of immortality.

• Kabuto Yakushi healed Grace's severe abdominal wound and introduced himself as an apothecary.
• Kabuto Yakushi blocked Suzuki Kimie's black flashes and analyzed her chakra-based attacks as Grace warned him about the sisters' situation.
• Kabuto Yakushi immobilized Suzuki Kimie and her ink sperm whale, then knocked Kimie unconscious and freed Suzuki Maika.
• Kabuto Yakushi removed Maika's bullet and healed her wound, then gave her a small black pill that quickly restored her color.
• Kabuto Yakushi collected Maika's blood and told Grace he had come to the Human World to search for the elixir of immortality.

Kabuto Yakushi explained that Suzuki Maika had distant monster ancestry and tested her blood with the Jeweled Branch of Mount Penglai, hoping it would lead him to the mermaids and the elixir of immortality. He took the unconscious Suzuki Kimie to help him search for Mount Penglai, while Sakaki Namiru received a call from her brother-in-law.

• Suzuki Maika woke after Kabuto Yakushi healed her, and she recognized him from the car accident in Tokyo.
• Kabuto Yakushi tested Suzuki Maika's blood on the Jeweled Branch of Mount Penglai, but it did not react, ruling out mermaid ancestry.
• Kabuto Yakushi told Suzuki Maika that she had distant monster ancestry and suggested her sister's octopus tentacles were connected to the octopus monster used in the fusion experiment.
• Kabuto Yakushi said he would take Suzuki Kimie to help him search for Mount Penglai, and Suzuki Maika reluctantly let him go after he promised to treat her sister.
• Kabuto Yakushi vanished with Suzuki Kimie, and Sakaki Namiru answered a call from her brother-in-law.

Grace investigated the Obama City supernatural incident with Uchiha Senmon, who connected the Jeweled Branch of Mount Penglai and mermaid lore to the five treasures from The Tale of the Bamboo Cutter. As Senmon pursued Tosu Hideo into Osaka, he wondered whether Mount Fuji was the true Mount Penglai and suspected Tosu had disguised himself as a supposedly dead Matori Group member.

• Sakaki Namiru called Uchiha Senmon in Obama City, but Grace took the phone and told him about the supernatural incident and the Jeweled Branch of Mount Penglai.
• Uchiha Senmon connected the mermaid-like Mound Fish and Mount Penglai through the Classic of the Regions Within the Seas, while Grace considered whether Yakushi might become a target for Tobi.
• Grace arranged for Suzuki Maika and Sakaki Namiru to go to the hospital so the Metropolitan Police Department could examine Maika for injuries, monster blood, and drug residue.
• As he traveled toward Osaka, Uchiha Senmon considered whether Mount Fuji was Mount Penglai and whether it held secrets linked to Tosu Hideo's transformation.
• Uchiha Senmon reviewed footage of a young man subduing an attacker on a Shinkansen and concluded that the supposedly dead Matori Group member might have been Tosu Hideo in disguise.

Tosu Hideo visited the former Moribe home to deliver Mr. Moribe’s letters, but discovered his wife Reiko had remarried and their daughter Mamiya had been missing for a year. After Hanyu revealed that Mamiya was working as a hostess in Tobita Shinchi, a mysterious figure attacked him and took his phone.

• Tosu Hideo reached the Moribe home in Osaka and learned from Reiko that the family had moved, though he suspected she was Mr. Moribe’s wife.
• Tosu Hideo overheard Reiko and Hanyu arguing about Mamiya’s disappearance and learned that Hanyu had allegedly made improper advances toward her.
• Hanyu showed Reiko a photo of Mamiya at a nightclub and said she was working as a hostess in Tobita Shinchi.
• Reiko left to tend to the baby while Hanyu stayed behind, and several black tendrils strangled him unconscious before a stitched hand took his phone.

Tosu Hideo traveled to Tobita Shinchi to deliver Mr. Moribe's letter and find Moribe Mamiya, after stopping a false groping accusation on the train. With help from Muto, he entered the members-only club where she worked, but learned she had been out of contact since the previous day.

• Tosu Hideo resisted killing the unconscious Hanyu and left the Moribe home after hearing a baby cry.
• On the subway, Tosu Hideo denied being the man in a viral arson-rescue video and disguised himself with a cap and glasses.
• Tosu Hideo defended a balding middle-aged man from a long-haired girl's false groping accusation, then left the train at Dobutsuen-mae Station.
• After waiting until night, Tosu Hideo entered Tobita Shinchi and went to the club where Moribe Mamiya worked.
• Muto recognized Tosu Hideo, helped him enter the members-only club, and told him that Mako had been out of contact since yesterday.

Tosu Hideo found Moribe Mamiya working at a hostess club and rescued her from a drunken customer who tried to molest her. After meeting her privately, he struggled to explain why he had sought her out and asked whether she liked Kamen Rider.

• Tosu Hideo learned that Mako had missed work, then saw Moribe Mamiya arrive at the club and waited to speak with her.
• Hanae told Tosu Hideo that Mamiya might be a single mother with a young child, leaving him shocked and worried for her.
• Tosu Hideo found Master Kagawa harassing Mamiya and forced him to apologize before sending him away with his companions.
• Mamiya agreed to meet Tosu Hideo at a bar after changing out of her work clothes.
• Tosu Hideo hesitated over what to ask Mamiya, then asked if she liked Kamen Rider.

Tosu Hideo told Moribe Mamiya that her father had died and gave her his letters, prompting her to leave the bar in shock. After she called to ask about her father, she failed to arrive at their meeting, and Tosu learned that a young woman had fallen from her apartment building.

• Moribe Mamiya said she hated Kamen Rider because her father had abandoned his family, and Tosu Hideo revealed that he had come to deliver her father's letters.
• Tosu Hideo told Moribe Mamiya that her father had died and gave her the letters; she read one, left the other unopened, and went home alone.
• Tosu Hideo secretly followed Moribe Mamiya to Mutsuki Apartments, then spent the night in Airin Slum.
• Moribe Mamiya called Tosu Hideo the next day to ask about her father's final days, and they arranged to meet at a family restaurant in Shinsaibashi.
• After Moribe Mamiya was more than two hours late and did not answer his calls, Tosu Hideo heard a news report that a young woman had fallen from the fourth floor of Mutsuki Apartments.

Tosu Hideo learned that Reiko had used Moribe Mamiya’s money to pay for Yukari’s treatment and promised to cover the sisters’ medical expenses while demanding that Reiko care for them. Desperate to raise a large sum, he entered a Kamen Rider merchandise shop, while a Kamen Rider later stormed into a meeting between rival yakuza groups and demanded their money.

• Reiko learned that Moribe Mamiya had suffered severe head trauma after falling from a window, and police said a stalker might have caused the fall.
• Tosu Hideo denied hurting Mamiya, promised to bring money for her treatment, and told Reiko to bring her child to the hospital.
• Reiko revealed that Yukari’s father was unknown and admitted she had used money Mamiya sent home to pay for Yukari’s medical care.
• Tosu Hideo restrained his anger, ordered Reiko to care for Mamiya and Yukari, and declared that Mr. Moribe was gone but he was his incarnation.
• Tosu Hideo realized he needed a large sum for the sisters’ medical costs, turned away from Tobita Shinchi, and entered a Kamen Rider merchandise shop.
• At an unmarked establishment, Tsuruoka and Okano argued over the transfer of Kodo-kai’s Tobita Shinchi businesses until a horned Kamen Rider burst in and demanded all the money.

Tosu Hideo, disguised as Kamen Rider, raided a Kodo-kai gathering to steal money for Moribe Mamiya’s medical bills, but a discovery in the safe and a betrayal led him to unleash his supernatural power. The chapter ended with the establishment burning as Tosu Hideo left the Yakuza’s fate unclear.

• Tosu Hideo demanded ten million yen from Okano and the Kodo-kai, then defeated their underlings when they attacked him.
• Tosu Hideo forced Okano to reveal the safe’s combination and found stacks of cash along with a packet of white powder.
• Okano stabbed Tosu Hideo repeatedly and seized the backpack of money while Scarface offered to help conceal the crime in exchange for Okano’s Tobita Shinchi establishments.
• Black tendrils erupted from Tosu Hideo’s wounds, and he wrapped Okano and Scarface in cocoons as they screamed.
• A fire erupted in a corner of Airin Second Chome.

Tosu Hideo met Reiko at the hospital to give her money for Moribe Mamiya’s treatment, but Metropolitan Police officers cornered him before he could leave Osaka. Uchiha Senmon offered cooperation instead of arrest, and Tosu Hideo began to reconsider fleeing as he voiced three lingering concerns.

• Tosu Hideo arrived at Osaka General Hospital burdened by guilt over the people he had killed and feared Jashin’s power was consuming him.
• Tosu Hideo gave Reiko a backpack full of money for Moribe Mamiya’s medical bills and warned her not to spend it on herself.
• Uchiha Senmon and Metropolitan Police officers revealed that they had tracked Tosu Hideo and surrounded him in the hospital.
• Uchiha Senmon told Tosu Hideo that the police wanted to work with him, framed his actions against the Boryokudan as protecting citizens, and urged him to consider his family.
• Tosu Hideo began to reconsider running away and told Uchiha Senmon that he had three things he could not stop worrying about.