Arc 9The Toyo High Infiltration

Sing Sing infiltrated Toyo High as Hoshino Seiichi to investigate the sixty-three people taken by the Japanese army, while also pursuing leads about Wolverine’s possible child. He uncovered a dangerous underground complex beneath the old school, clashed with the school’s delinquents, and learned that Mariko had confirmed her child was adopted.

  • Director Wang tasked Sing Sing with investigating the sixty-three Toyo Registry victims under the identity Hoshino Seiichi, and Sing Sing arrived in Japan to begin the mission.
  • Sing Sing enrolled in Toyo High’s Class 3-D, defeated the blond student demanding protection money, and won the class’s support while learning about the school’s factions.
  • Sing Sing confronted Yukio, learned of her past with Old Man Jin and Mariko, and asked Liu Jianyi to investigate Mariko and the Yashida Family for clues about Wolverine’s possible child.
  • Sing Sing joined Saeko Busujima’s Kendo Club, discovered that machinery operated beneath the old school, and descended into an underground complex where a mutated patient attacked him.
  • Deadpool appeared during Sing Sing’s fight with the monster, and the pair escaped to Mount Fuji after Deadpool’s teleportation belt activated.
  • Sing Sing returned to Tokyo, sent Deadpool to investigate Silver Peak, and outmaneuvered Eikichi Onizuka after Onizuka tried to test him in class.
  • Sing Sing stopped Genji Takiya from escalating a cafeteria confrontation, held back during their fight, and earned Genji’s admission of defeat.
  • Sing Sing taught Saeko about his swordsmanship, punished Mitsuhashi and Ito for spreading rumors, and learned from Yukio that Mariko had said her child was adopted.
Chapters 201–225 Vol. 3 Read

Ch. 201A Legacy of History

Director Wang briefed Sing Sing on the Toyo Registry Case, in which Japanese forces detained and experimented on sixty-three people during the war, and ordered him to infiltrate Toyo High School as a student to investigate. Sing Sing accepted the mission after failing to win extra allowances, leaving with the file and his fake identity as Hoshino Seiichi.

  • Director Wang revealed that the Toyo Registry Case concerned sixty-three people captured by the Japanese army, with nineteen confirmed dead, eleven escaped, and thirty-three missing.
  • Sing Sing learned that project leader Kurokawa Sōichi had ordered the detainees killed and the transfer station destroyed, while Morikawa Kiyoshi had helped eleven detainees escape and was shot for it.
  • Director Wang tasked Sing Sing with finding information about the victims, gathering evidence, and recovering anything taken from them, using Wolverine's child as cover for the mission.
  • Director Wang explained that Sing Sing would pose as a seventeen-year-old transfer student named Hoshino Seiichi because Toyo High School was opening parts of its old building for student clubs to inventory.
  • Sing Sing tried to negotiate clothing, emotional-distress, and nutrition allowances, but agreed to go when Director Wang threatened to send Anton along to monitor his expenses.

Ch. 202A Night Out in Kabukicho

Sing Sing arrived in Japan and met Liu Jianyi, who took him to a hidden karaoke room in Kabukicho before his first day at school. Sing Sing fended off the women’s advances by pretending to diagnose Mai and offering to treat her.

  • Sing Sing arrived at Haneda Airport carrying Wenxi’s modified Dimension Box and met Liu Jianyi, who picked him up in a seafood-advertisement truck.
  • Sing Sing complained that Liu Jianyi had brought him to Kabukicho despite his high school student identity, and Liu Jianyi said he would take him to school the next day.
  • Liu Jianyi revealed a hidden karaoke room behind a bar, where four women greeted Sing Sing by name.
  • Mai and Nana flirted with Sing Sing, who awkwardly tried to shrink into the sofa.
  • Sing Sing checked Mai’s pulse, claimed she had too much cold in her body, and offered to treat her and Nana.

Ch. 203What's Wrong with Developing Too Fast? Haven't You Heard of Early Maturity?

Sing Sing arrived at Toyo High School disguised as the seventeen-year-old transfer student Hoshino Seiichi and met Ito Shinji, who guided him around campus. After learning that the old school building and underground air-raid shelter were rumored to be haunted, Sing Sing was taken to the academic affairs office by Teacher Kumiko, while Ito suspected he could fight.

  • Liu Jianyi dropped Sing Sing at Toyo High School, where a buzz-cut student mistook him for a middle-aged man and Sing Sing insisted he was an early-maturing transfer student.
  • Ito Shinji offered to show Sing Sing around and led him past campus facilities and a vending machine that sometimes swallowed coins.
  • Ito told Sing Sing the old school building and underground air-raid shelter were rumored to be haunted, prompting Sing Sing to mention ghosts in military uniforms.
  • Teacher Kumiko Yamaguchi met Ito and Sing Sing, checked Sing Sing's documents, and escorted him to the academic affairs office.
  • After Sing Sing and Kumiko left, Ito told Mitsuhashi that the new transfer student looked like he could really fight.

Ch. 204The new boss of Class 3-D

Hoshino Seiichi transferred into Class 3-D and quickly subdued the class delinquents before declaring himself the class boss. Kumiko Yamaguchi returned and caught him making the announcement.

  • Kumiko Yamaguchi introduced Hoshino Seiichi as the new transfer student in Class 3-D.
  • Hoshino Seiichi realized he could get the class to help investigate the old school building.
  • The blond leader demanded protection money, but Hoshino Seiichi defeated him and his two companions.
  • Hoshino Seiichi ordered the boys to clean the classroom and line up, then abolished protection money and promised to defend Class 3-D.
  • Kumiko Yamaguchi returned and challenged Hoshino Seiichi about declaring himself the class boss.

Ch. 205Hoshino Seiichi, Model Student

Hoshino Seiichi tried to hide his gang-leader behavior from Kumiko Yamaguchi by acting like a model student, but he struggled to follow the lesson. The chapter ended with Kumiko testing him by asking him to read a passage aloud.

  • Kumiko Yamaguchi caught Hoshino Seiichi and the boys standing by the wall, and Sing Sing claimed they were practicing posture and preparing to welcome her.
  • Sing Sing persuaded the class to praise Kumiko Yamaguchi, then returned to his seat and behaved like an eager student.
  • Kumiko Yamaguchi noticed signs of a scuffle but let the boys return to their seats.
  • Sing Sing drifted into a fantasy about being trapped in prison until Ichirai Hisako nudged him and warned him that the teacher was watching.
  • Kumiko Yamaguchi asked Hoshino to read a passage from the textbook aloud.

Ch. 206A Max-Level Agent's Everyday High School Survival

Sing Sing endured his first morning of classes at the Japanese high school, using his work experience to excel at math and his time in America to impress his English teacher. At lunch, he reflected on the victims hidden in the chained-up old school building before Ito Shinji and Mitsuhashi Takashi arrived on the rooftop.

  • Sing Sing struggled through a Japanese reading assignment, and Kumiko Yamaguchi threatened to make him copy the passage a hundred times if he spaced out again.
  • Ichirai Hisako quietly helped Sing Sing follow along in class as he completed a math problem with detailed expense calculations and read an English dialogue in a convincing Brooklyn accent.
  • Sing Sing opened the meager bento Liu Jianyi had issued him and suspected Liu Jianyi had skimmed the food allowance.
  • Sing Sing went to the rooftop, looked over the campus, and thought about the sixty-three people who had been brought to the school and treated as expendable supplies.
  • Ito Shinji and Mitsuhashi Takashi came onto the rooftop arguing about a piece of fried chicken.

Ch. 207As a Greeting Gift, Your Sausage Is Mine

Hoshino Seiichi ate lunch on the rooftop with Ito Shinji and Mitsuhashi Takashi, where he met Serizawa Tamao, the feared leader of the Serizawa Army. After Hoshino deflected Serizawa’s suspicions by blaming Mitsuhashi, Serizawa claimed Hoshino’s sausage as a greeting gift.

  • Ito Shinji introduced Hoshino Seiichi to Mitsuhashi Takashi, who described himself as a future legend.
  • Hoshino asked about the school’s factions, and Ito explained that Serizawa Tamao was the King of Beasts and leader of the Serizawa Army.
  • Mitsuhashi urged Hoshino to help take down Serizawa, but Hoshino refused to fight someone above his level.
  • Serizawa jumped down from the platform, asked Mitsuhashi for fried chicken, and accused Hoshino of trying to take over his position.
  • Hoshino blamed Mitsuhashi for plotting against Serizawa, prompting Mitsuhashi and Ito to argue.
  • Serizawa accepted Hoshino’s Class 3-D underlings and claimed Hoshino’s sausage as a greeting gift.

Ch. 208The King of Beasts Puts Him to the Test

Sing Sing tested his strength against Serizawa before Mitsuhashi defused their confrontation with fried chicken. Later, Liu Jianyi briefed Sing Sing on Mariko Yashida, Yukio, and Itsu, and Sing Sing set off to find Yukio himself.

  • Serizawa struck at Sing Sing after Sing Sing slapped away his attempt to take the lunchbox, but Sing Sing blocked the punch while holding his food.
  • Mitsuhashi offered Serizawa his fried chicken bento, ending the standoff before the two could fight in earnest.
  • Liu Jianyi told Sing Sing that Mariko Yashida was a powerful businesswoman, Yukio was a former bodyguard turned assassin, and Itsu was difficult to locate.
  • Sing Sing assigned Liu Jianyi to investigate Mariko and Itsu, then asked for Yukio's address so he could confront her.

Ch. 209Da Vinci's Custom-Made Anomalous Containment Restraints

Sing Sing visited Yukio’s dojo to ask about Old Jin’s past, but she attacked him when he mentioned the old man and his possible children. After disarming and tying her up with Da Vinci’s custom-made restraints, Sing Sing prepared to question her about Old Jin’s romantic debts.

  • Sing Sing used Da Vinci’s modified Dimensional Briefcase to change into a suit and went to the address Liu Jianyi had given him.
  • Yukio quoted her assassination fee, and Sing Sing asked whether she would discount a job involving Old Jin and his six steel claws.
  • Yukio attacked Sing Sing with her swords, while he dodged and joked about Old Jin’s old lovers and possible children.
  • Sing Sing disabled Yukio’s sword hand, knocked away her other sword, and avoided her kick before pinning her down.
  • Sing Sing used the dimensional case to produce nylon restraints and bound Yukio, then asked to discuss Old Jin’s romantic debt.

Ch. 210A Warrior Can Be Killed but Not Humiliated. How Dare You Say My Acting Sucks?!

Sing Sing confronted Yukio about her history with Logan, but she revealed a bitter account of Logan’s rampage that Sing Sing exposed as a fabricated story. After restraining Yukio, Sing Sing questioned her about a possible child with Logan and was left wondering what had really happened between them.

  • Sing Sing showed Yukio a video of Logan alive in China, and Yukio admitted she wanted to kill him if they met again.
  • Yukio claimed Logan’s berserk rampage had destroyed the Kansai neighborhood where she grew up and killed the blind woman who raised her.
  • Sing Sing used a photograph to expose Yukio as a Yashida Family assassin and accused her of inventing her tragic backstory.
  • Yukio attacked Sing Sing, but his adaptive restraints tightened around her and held her in place.
  • Sing Sing asked whether Yukio had secretly had Logan’s child, and her furious denial seemed genuine to him.

Ch. 211North America's Chen Shimei and the Long-Suffering Female Supporting Character

Sing Sing questioned Yukio about her history with Old Man Jin and learned that Mariko Yashida had a child more than ten years earlier, who would now be seventeen or eighteen. After Yukio refused to help him approach Mariko, Sing Sing asked whether she knew someone named Itsu.

  • Sing Sing deduced that Yukio had once been involved with Old Man Jin, and she admitted they had been together briefly before he disappeared.
  • Yukio explained that Mariko loved Old Man Jin, but Mariko’s master opposed their relationship and Yukio took him to a remote village to hide.
  • Yukio confessed that she slept with Old Man Jin while trying to comfort him, then left Mariko’s family after he vanished.
  • Yukio revealed that she later saw Mariko holding a baby, whom the family claimed was an orphan from a branch family.
  • Sing Sing freed Yukio and asked her to help him investigate Mariko, but she refused and threatened to resist him.
  • Sing Sing abandoned his attempt to reach Mariko through Yukio and asked whether she knew someone named Itsu.

Ch. 212Mitsuhashi the Screwup Courts Death Again!

Sing Sing persuaded Yukio to help him investigate whether Mariko’s adopted child was Wolverine’s child, then returned to Toyo High School and found himself treated as the new boss of Class 3-D. The chapter left Sing Sing and the delinquents pretending to study as Kumiko Yamaguchi entered the classroom.

  • Sing Sing offered Yukio Old Goldhead’s address in exchange for her help, and she agreed to let him investigate whether Mariko’s child was his.
  • Sing Sing told Liu Jianyi that Mariko had a seventeen- or eighteen-year-old adopted child whose age matched Wolverine’s disappearance in Japan, and asked him to investigate the Yashida Family.
  • At Toyo High School, Sing Sing caught Mitsuhashi Takashi and Ito Shinji after Ito revealed that Mitsuhashi had distributed challenge flyers in Sing Sing’s name.
  • Class 3-D’s delinquents bowed to Sing Sing, pampered him, and offered him homework, which he accepted after scolding them.
  • Kumiko Yamaguchi entered the classroom, and Sing Sing and the delinquents hurriedly pretended to read their textbooks.

Ch. 213Peace Ambassador One Second, Cao Cao the Next

Hoshino Seiichi turned down the Judo, Karate, and Aikido clubs before eagerly joining Saeko Busujima’s Kendo Club. After learning she had badly injured a delinquent who approached her, Hoshino still insisted on going and dragged Mitsuhashi Takashi and Ito Shinji along.

  • Kimura Okuma, Inoue Panghu, and Meimiya Akihiro invited Hoshino to join their clubs, but he refused unpaid work and demanded expenses be covered.
  • Saeko Busujima invited Hoshino to join the Kendo Club, and he enthusiastically accepted after learning she was eighteen.
  • Mitsuhashi and Ito warned Hoshino that Saeko had given a delinquent multiple fractures and left him hospitalized for months.
  • Hoshino declared that he was not afraid of the Kendo Club and pulled Mitsuhashi and Ito along to go with him.

Ch. 214I Know a Little

Sing Sing was dragged to the Kendo Club, where Saeko Busujima challenged him to a sword fight. After he disarmed her with an unfamiliar technique, Saeko asked him to teach her and appointed him chief instructor.

  • Sing Sing dragged Mitsuhashi and Ito to the Kendo Club, where Kimura Okuma, Inoue Panghu, and Meimiya Akihiro were cleaning under Saeko Busujima's watch.
  • Saeko Busujima challenged Sing Sing to a bamboo-sword match after he claimed he wanted to practice swordsmanship.
  • Sing Sing dodged Saeko's opening strike, then used a sticking technique to disarm her.
  • Saeko asked Sing Sing to teach her sword technique and made him the Kendo Club's chief instructor.

Ch. 215Following-the-Logic Sword!

Sing Sing invented a sword style to explain how he had deflected Saeko Busujima’s strike, then learned that machinery could be running beneath the sealed old school building. He stayed at school to investigate the suspicious underground facility while Saeko left to practice his assigned exercise.

  • Saeko Busujima asked Sing Sing to teach her the sword technique he had used against her.
  • Sing Sing described his made-up Cook Ding Cuts Up an Ox Sword and taught Saeko to move quietly around the dojo.
  • Saeko told Sing Sing that the old school building had underground civil defense works and that she had heard machinery running beneath it at night.
  • Sing Sing gave Saeko a newspaper ball to practice cutting apart and claimed he would stay behind to confront the building’s evil spirits.
  • Saeko left the dojo determined to complete her training, and Sing Sing turned his attention back to the old school building.

Ch. 216Late-Night Modifications. Did You File the Paperwork?

Sing Sing broke into the old school and discovered a vast underground facility containing grotesque human-machine experiments. After finding the source of Saeko Busujima’s reported mechanical noise, he confronted a mutated patient and charged at its saw-toothed tentacle.

  • Sing Sing evaded the campus cameras, picked the old building’s lock, and found a hidden elevator shaft behind a storage-room door.
  • Sing Sing descended more than two hundred meters into an underground complex lined with blast doors and ventilation ducts.
  • Sing Sing photographed a sterile room containing culture tanks and a half-flesh, half-metal human leg, then heard mechanical clicking in the corridor.
  • A deformed patient emerged and transformed his arm into a massive, chainsaw-like tentacle.
  • The patient attacked Sing Sing, who dodged the strike and rushed toward the mutated tentacle with his hand on his sword.

Ch. 217A Divine Ass Descended from the Heavens!

Sing Sing fought a rapidly mutating biomechanical monster in the corridor, cutting off one of its tentacles with Inner Qi before it revealed a gun hidden in its chest. Just as the monster aimed at him, Deadpool fell from a spatial vortex and bent the gun barrel with his landing.

  • Sing Sing’s Pig Butchering Knife lodged in the monster’s serrated tentacle, and he mocked its biologically powered machinery.
  • The monster grew a spiked bone shield and charged, but Sing Sing slipped past it and drove his knife into its chest.
  • Red tendrils attacked Sing Sing’s glove, so he used Inner Qi to free the blade and severed the monster’s chainsaw tentacle.
  • The monster began regenerating its arm and opened its chest to reveal a gun aimed at Sing Sing.
  • Deadpool fell from a spatial vortex and landed on the gun barrel, bending it downward.

Ch. 218Things are getting hairy, time to run!

Sing Sing and Deadpool fought a regenerating monster, but it summoned something from underground and forced them to flee. Deadpool’s faulty teleportation belt carried them to an unfamiliar snowy slope.

  • Deadpool landed on the monster and lost a hand to its counterattack, but it began to regenerate as Sing Sing watched for an opening.
  • The monster attacked Deadpool with venomous tentacles, and Sing Sing noticed that it reacted to Deadpool’s insults and that its abdominal metal ring contracted whenever it released tentacles.
  • As the monster grew larger by reclaiming its severed parts, Sing Sing cut through a tentacle and spotted a possible seam around the ring.
  • The monster pinned Deadpool to a wall with drill-tipped tentacles, and Sing Sing freed him before a strange pulse from its chest drew answering thumps from underground.
  • Sing Sing grabbed Deadpool and tried to escape, and Deadpool’s teleportation belt finally activated, transporting them to a snow-covered slope.

Ch. 219Yan Shuangying Toys with Little Deadpool

Sing Sing learned that Mueller had been killed by Agent Zero and heard how Deadpool’s pursuit led him to a disastrous encounter with Yan Shuangying. The story left Deadpool in New Mexico, where Yan Shuangying waited for an idiot dressed in red.

  • Sing Sing confronted Deadpool on Mount Fuji after Deadpool teleported them there instead of returning him in time for school.
  • Deadpool showed Sing Sing surveillance footage of Agent Zero executing Mueller, and Sing Sing questioned whether the agent had been a clone.
  • Deadpool recounted finding a leather-coated man in New Mexico who challenged him and struck him with a revolver.
  • Three days earlier, Deadpool confronted Yan Shuangying in a warehouse and repeatedly failed to shoot or outfight him.
  • Yan Shuangying told Deadpool he was waiting for an idiot dressed in red.

Ch. 220Using Your Hand to Slap Your Face

Deadpool told Sing Sing how Agent Zero killed Mueller, then the two fell through the snow into a Japanese hot spring surrounded by armed yakuza. They faced the gangsters as Deadpool cheerfully offered to join their film.

  • Yan Shuangying stole Deadpool’s grenade, beat him with a boot, and slapped him with his own severed arm until Deadpool agreed to answer questions.
  • Deadpool showed Sing Sing security footage of Agent Zero shooting Mueller and explained how he found Sing Sing by asking Destiny.
  • Sing Sing said Mueller had already shared what he knew and that they would have to rely on Second and Fifth against Silver Peak.
  • The snow beneath Sing Sing and Deadpool collapsed, sending them tumbling into a hot spring in a Japanese-style courtyard.
  • A group of tattooed Japanese men and armed underlings confronted them, while Deadpool greeted the gangsters and offered to join their film.

Ch. 221Deadpool Wants to Wear a Sailor Uniform

Sing Sing and Deadpool escaped an Ōedo Family hot spring after defeating a group of henchmen, and Kumiko Yamaguchi recognized Sing Sing from a portrait. Sing Sing then tricked Deadpool into returning to New York to investigate Silver Peak, leaving him free to resume investigating the old school building later.

  • Sing Sing and Deadpool fought off Ōedo Family henchmen at the hot spring and escaped using Deadpool’s belt.
  • Kumiko Yamaguchi learned that one of the intruders was Hoshino Seiichi and recognized him from a portrait.
  • In a Tokyo alley, Deadpool asked to join Sing Sing’s undercover high school life, but Sing Sing refused.
  • Sing Sing persuaded Deadpool to return to New York and investigate Silver Peak by promising him a senior company title.
  • Deadpool teleported to New York, while Sing Sing planned to investigate the old school building again after getting some sleep.

Ch. 222Trying to Prank Me? You're Still Too Green!

Sing Sing denied Kumiko Yamaguchi’s accusation that he had fooled around at a hot spring, then faced Eikichi Onizuka’s attempt to test him during P.E. He outmaneuvered Onizuka and kept the teacher’s prized photo book as leverage.

  • Kumiko Yamaguchi questioned Sing Sing about a report that he had been fooling around at a hot spring, and he denied it.
  • Eikichi Onizuka took over Class 3-D’s P.E. lesson and secretly spilled motor oil on the podium before calling Sing Sing up to the blackboard.
  • Sing Sing crossed the oily floor without falling, stole Onizuka’s photo book, and wrote only the words “equipment list” on the board.
  • Sing Sing warned Onizuka about the oil and threatened to use the photo book to embarrass him, then kept it as collateral.
  • Onizuka realized that Sing Sing had turned his attempt to size him up into a loss of his prized possession.

Ch. 223Showdown at the Top! Genji Takiya Steps In

Hoshino Seiichi stopped GPS boys from harassing a first-year girl in the cafeteria and defeated two of them. After one of the boys exaggerated the incident to Genji Takiya, Genji decided to confront Hoshino.

  • Sing Sing recovered Eikichi Onizuka’s photo book after Onizuka promised him full marks on his exam.
  • Hoshino intervened when a blond GPS member harassed a first-year girl in the cafeteria.
  • Hoshino knocked down the blond and his companion, then took the dropped pork cutlets for his lunch.
  • A fleeing GPS member told Genji Takiya a fabricated version of the fight and claimed Hoshino had challenged Genji’s authority.
  • Genji and Izaki Shun headed to the cafeteria to meet Hoshino.

Ch. 224Fingertips at Your Throat, Big Brother Will Teach You a Lesson

Sing Sing faced Genji Takiya after disciplining GPS members who had harassed a female student, and the two fought in the cafeteria. Genji admitted defeat after realizing Sing Sing had held back, while Sing Sing left him with a demand that GPS line up for food and stop wasting it.

  • Genji Takiya confronted Sing Sing over attacking a GPS member and challenged him to a fight, agreeing that GPS would line up and avoid wasting food if Sing Sing won.
  • Sing Sing caught Genji's first punch and evaded his attacks as they fought among the cafeteria tables and chairs.
  • Sing Sing stopped his fingers near Genji's throat, then straightened Genji's collar instead of striking him.
  • Genji tried to throw Sing Sing, but Sing Sing reversed the move and steadied him before he could hit a table or soup bucket.
  • Sing Sing explained that he had held back because Genji had not bullied the female student, and Genji admitted defeat before promising to challenge him again.

Ch. 225Who Said My Disciple and I Are Having an Affair?

Sing Sing trained Saeko Busujima in swordsmanship and fought Mitsuhashi Takashi and Ito Shinji after they accused him of having an affair with his disciple. A message from Yukio then revealed that the child they had been investigating was adopted, though Yukio had asked Mariko directly.

  • Saeko Busujima reported how she had carefully separated an old newspaper and brought Sing Sing fried fish cakes.
  • Sing Sing praised Saeko's control and explained that his sword technique focused on observation, judgment, and conserving strength.
  • Mitsuhashi Takashi and Ito Shinji eavesdropped, decided Sing Sing and Saeko were having an affair, and confronted them.
  • Sing Sing defeated Mitsuhashi and Ito in a fight, then punished them for eavesdropping and spreading rumors.
  • Yukio messaged Sing Sing that Mariko had said the child was adopted, and Sing Sing realized Yukio had asked her directly.
Arc 9 of 19
Arc 9 of 19