Chapter Summaries

Baicang, an ordinary citizen in the dangerous world of One-Punch Man, decided to join the Hero Association so he could grow stronger and protect his sister, Runo. Runo reluctantly accepted his decision, and Baicang planned to take the Hero Assessment in two days.

• Baicang watched news of a monster attack and reflected on the dangers of the world and his weekly-changing superpower.
• Runo came home, and Baicang welcomed his clingy younger sister and recalled how a monster had once left him gravely injured.
• Baicang used his Knife Master superpower while preparing pork cutlet curry rice, which Runo praised enthusiastically.
• Runo asked whether Baicang intended to become a Professional Hero, and he explained that he wanted to grow stronger and protect her.
• Runo reluctantly agreed to Baicang joining the Hero Association, and he said he would take the fifty-third Hero Assessment in two days.

Baicang took the Hero Association assessment, hoping to qualify as a hero, but his newly refreshed superpower was only a tiny discount on purchases. Just as he revealed it in his interview, an alarm reported a Demon-level disaster in A City.

• Runo wished Baicang luck as he left for the assessment, then sneaked into his room and brooded over the Hero Association.
• Baicang encountered Blue Tornado promoting himself in City M and went to the Hero Association branch for the assessment.
• Baicang completed the written exam and physical tests, then was summoned to an interview because he had applied as an esper.
• Baicang told the interviewers that his power changed weekly and confessed that this week's ability made purchases slightly cheaper.
• An alarm announced a major Demon-level disaster in A City.

Baicang ran into Saitama after the Pig-Headed Monster attacked him, and Saitama killed the monster with one punch. Baicang used supermarket discounts to persuade Saitama to shop with him and asked to become his disciple, but Saitama had not yet agreed.

• The Hero Association announced a Demon-level emergency, interrupting Baicang’s ranking assessment and sending staff out to assist.
• Baicang headed to a supermarket and narrowly dodged an ambush by the Pig-Headed Monster, who had injured him before.
• Saitama appeared in the alley and killed the Pig-Headed Monster with a single punch.
• Baicang offered Saitama double discounts at Daimaru Supermarket, and Saitama agreed to shop with him.
• Baicang praised Saitama, told him he wanted to protect his little sister, and asked to become his disciple and get his contact information.

Baicang learned that he had passed the Hero Association assessment but was ranked C-Class, 77, and worried about supporting Runo as monster attacks grew more dangerous. After running out of money, he took to patrolling City M on the pink scooter Runo had refused to ride.

• Baicang returned home without the promised eel, told Runo a monster had stolen it, and reassured her that he was unharmed.
• At the Hero Association's City M branch, Lady Tatsumaki insisted Baicang deserved a C-Class ranking.
• Baicang received his assessment results: 75 points, C-Class, rank 77, and tried to comfort Runo about his low rank.
• Baicang realized A City's destruction matched Vaccine Man's attack and warned Runo to seek shelter during emergencies.
• After several days, Baicang ran out of money, took the pink scooter he had bought for Runo, and began patrolling City M for work.

Baicang arrived at a bank robbery just in time to save the bank manager from the bald robber, then defeated the brute with attacks on his vulnerable spots. The other robbers fled after emerging from the vault, while Baicang stayed behind with the shaken manager.

• Baicang heard a commotion, rode to the bank, and found four robbers holding the customers and employees hostage.
• The clown-masked robber threatened to shoot someone unless the bank manager came forward, and a frightened customer identified the black-haired woman.
• The bald brute tried to grab the manager, but she slapped him, and he swung his spiked club at her.
• Baicang caught the club, kicked the bald brute through the counter glass, and incapacitated him with a series of low blows.
• Baicang checked on the manager, and the three robbers returned from the vault, saw their fallen boss, and ran away.

Baicang recovered the stolen cash after stopping a bank robber, then returned home with a supposed bank reward. Meanwhile, Runo secretly hunted and destroyed a monster before reuniting with Baicang, who vowed to protect her.

• Baicang let the bank robbers escape, then tracked down the scar-faced robber and took his bag of cash.
• Baicang returned the money he had recovered to the bank, where a black-haired woman gave him a reward and crowds of fans swarmed him.
• At City M First High School, Runo left early and sensed a monster hiding in an alley.
• Runo froze Ratman, who vanished after she left, and flew away from the alley.
• Baicang brought the reward money home, played with Runo, and silently vowed to protect her.

Baicang planned to move with Runo to Q City for her safety and better hero work opportunities, then rescued a woman from a frog monster. Tank-Top Tiger stole the fight, but Baicang sabotaged him with his new power, defeated the monster, and won the crowd’s admiration.

• Baicang persuaded Runo to move to Q City, explaining that it would be safer and help him advance as a hero.
• Baicang rode to Q City and kicked a frog monster’s tongue away from a college girl it was attacking.
• Tank-Top Tiger interrupted Baicang and claimed the fight, while Baicang told the rescued girl that Tiger bullied him and stole his credit.
• Baicang used his Plague Source power to give Tank-Top Tiger diarrhea during the fight, then killed the frog monster with a kick and a stomp.
• Tank-Top Tiger fled in humiliation as the crowd praised Baicang, and the rescued girl decided to tell her friends about Tiger’s mistreatment of him.

Baicang bought an apartment for Saitama and persuaded him to accept him as a disciple, then learned Saitama’s training routine. Short on money, Baicang dressed as Batman and confronted a motorcycle gang to rob them.

• Baicang rented an apartment near the city center and bought Saitama’s home as a gift to secure his mentorship.
• Baicang cooked for Saitama, who taught him a daily routine of push-ups, sit-ups, squats, and a ten-kilometer run.
• After spending most of his savings, Baicang decided to take dirty money from criminals and bought a dark costume.
• Baicang went out at night in disguise and watched a motorcycle gang terrorize pedestrians.
• When a gang member challenged him, Baicang introduced himself as Batman and declared that he was robbing them.

Baicang robbed Kenta’s gang, coerced Kenta into gathering underworld information, and learned where the crime boss Onibi Maru was hiding. He found Onibi Maru at a warehouse, where the boss was murdering captives as sacrifices, and announced a robbery.

• Baicang defeated Kenta and his gang, then took their money and learned that they paid protection money to Onibi Maru.
• Baicang forced Kenta to gather information on nearby gangs and gave him candy while pretending it was poison and an antidote.
• Kenta revealed Onibi Maru’s hideout, and Baicang let him flee after warning him not to hurt anyone.
• At an abandoned warehouse, Onibi Maru killed a bound man with a meteor hammer and ordered his gang to find more sacrifices.
• Baicang arrived at the warehouse, introduced himself as Batman or Evil Buster, and declared a robbery.

Baicang confronted Onibi Maru and discovered that his obsession with his motorcycle was tied to a strange transformation. After Onibi Maru merged with the bike and became a half-human, half-machine monster, Baicang recognized the process as monsterization.

• Onibi Maru charged Baicang with his meteor hammer, but Baicang kicked him off his motorcycle.
• Baicang noticed Onibi Maru's erratic behavior and questioned him while threatening his beloved bike.
• Onibi Maru explained his intoxicating thrill of hunting people on the motorcycle, and Baicang damaged its engine by revving it.
• Onibi Maru rushed to his smoking motorcycle, then transformed and absorbed it into his body.
• Onibi Maru emerged as a towering half-human, half-machine monster, and Baicang identified the change as monsterization.

Baicang fought and killed Onibi Maru after the biker gang leader transformed into a motorcycle monster, but he realized too late that he had forgotten to recover the stolen money. He returned home without a monster defeat to report, while Tanktop Girl and the authorities arrived at the factory and found Onibi Maru’s corpse.

• Onibi Maru transformed into a motorcycle monster and repeatedly charged Baicang, who dodged and tested his strength in their first head-on battle.
• Baicang knocked Onibi Maru off balance and struck him, but Onibi Maru used a piercing horn to stun Baicang and hurl him into a guardrail.
• Baicang used his psychic power to stop Onibi Maru, then disabled his wheels, tore off his arms, and crushed his neck.
• Baicang realized he had forgotten to seize the stolen money and returned home upset that he could not report the monster defeat to the Hero Association.
• Police officers and Hero Association personnel reached the factory, where Tanktop Girl found Onibi Maru’s mangled corpse.

Baicang took Runo shopping for furniture, then left her to investigate someone secretly following him. He ambushed the pursuer in a secluded spot and discovered he had grabbed the chest of a tall blonde girl.

• Runo woke Baicang and reminded him that he had promised to take her shopping for new furniture.
• At Moriha Shopping Plaza, Baicang bought Runo a television at a discounted price and helped her choose more furniture.
• While resting with Runo, Baicang sensed someone watching him and sent her home before trying to evade the pursuer.
• Baicang lured the follower into a secluded area and attacked from around a corner.
• Baicang realized the person he had grabbed was a tall blonde girl, and he begged her not to act.

Baicang cleared up Captain Mizuki’s mistaken belief that he was Tanktop Girl’s cheating boyfriend, then convinced her to learn hero work by following him. Their first outing together ended with Mizuki terrifying an elderly woman during a rescue, so Baicang hurriedly led her away.

• Mizuki attacked Baicang after mistaking him for Tanktop Girl’s boyfriend, but learned he had been shopping with his younger sister Runo and did not know Tanktop Girl.
• Baicang made up a story to explain why he had grabbed Mizuki, and she apologized for causing trouble.
• Baicang recalled Mizuki’s potential as a future S-Class Hero and persuaded her to stay with him and learn how to handle incidents.
• Mizuki used a relay baton to pole-vault across the road, carry an elderly woman over, and frighten her badly.
• Baicang dragged Mizuki away before the old woman’s family could arrive.

Baicang reluctantly met Mizuki for an early-morning training session, but her runaway warm-up led them into a fight with food-themed monsters. After Baicang helped defeat the attackers, Mizuki finished off the remaining monsters, leaving her covered in broth and grease.

• Baicang answered Mizuki’s persistent call and agreed to meet her at Central Park, then arrived at five in the morning.
• Mizuki showed Baicang that her medals could transform into a discus, and they set off on a ten-kilometer run.
• Mizuki sprinted away before they chose a route and ran into several monsters attacking the street beside an overturned food cart.
• Baicang rescued Mizuki from the food-themed monsters, dodged their attacks, and defeated several of them.
• Mizuki defeated the Meatball Monster and Cabbage Monster, while Baicang noticed that their broth had soaked through her sportswear.

Baicang rescued Mizuki during a monster attack, learned that the Yamato Group was harassing Sachiko, and helped her and her son by paying for food in advance. After training Mizuki and spending the day with Saitama, Baicang met Kenta at night to ask about the Yamato Group.

• Baicang scolded Mizuki for rushing into danger, then learned that Sachiko's late husband had left her in debt to loan sharks connected to the Yamato Group.
• Baicang paid Sachiko in advance for three months of breakfasts and took Mizuki to her home after spotting men watching them.
• Baicang noticed Sachiko's family memorial portrait, then left with Mizuki after she washed up.
• Baicang trained Mizuki, called the Hero Association to ask about weapons, and spent the afternoon playing video games with Saitama.
• Baicang met Kenta at night and asked whether he knew the Yamato Group.

Baicang went to a Yamato Group casino to pick a fight and avenge Sachiko, but his attempt to win money by gambling ended with him smashing the table and fighting the casino’s men. He reached a private room where Lord Kawaguchi and Lord Black Tiger were meeting.

• Baicang forced Kenta to tell him what he knew about the Yamato Group, including its casinos and its hired hero, then headed to one of its casinos.
• Baicang disguised himself in a borrowed suit and bat mask, talked his way past the guards with help from manager Jing Zhong, and exchanged his wallet for chips.
• Baicang bet all his chips on small, lost, and accused the casino of cheating before punching a thug and breaking the gambling table.
• Baicang demanded to see the boss, fought his way through the casino, and had the dealer lead him to the private room where Lord Kawaguchi and Lord Black Tiger were meeting.
• Baicang knocked out the guards outside the room, sent the dealer away, and kicked open the door.

Baicang fought his way through the Yamato Group and confronted its B-Class Hero protector, Black Tiger. After defeating Black Tiger with his superpower, Baicang ordered the group’s boss to hand over all its money.

• Baicang charged through the Yamato Group’s lackeys, dodged their gunfire, and disarmed several gunmen.
• The Yamato Group’s boss called for Black Tiger, who revealed himself as a B-Class Hero and defended the gang’s belief that ordinary people should serve him.
• Baicang fought Black Tiger with pistols and used his superpower to give him severe stomach trouble.
• Black Tiger lost control of himself and Baicang punched him unconscious.
• The Yamato Group’s boss tried to flee, fell, and Baicang pointed a gun at him and demanded all the group’s money within three minutes.

Baicang forced the Yamato Group's boss to surrender his hidden wealth and turn himself in, then moved into a new apartment with Runo. When Saitama arrived for a hot-pot gathering, Runo was terrified of him and refused to let him inside.

• Baicang robbed the Yamato Group's boss, ordered him to confess his crimes and dealings with Black Tiger, and left with the recovered money.
• Baicang and Runo moved into a spacious apartment that Baicang had equipped with games, manga, and other entertainment for future guests.
• Baicang prepared hot pot and asked Runo to answer the door when Saitama arrived.
• Runo screamed at the sight of Saitama, then stood between him and Baicang and refused to let him enter.
• Baicang picked Runo up to calm her, leaving her blushing in his arms while Saitama waited awkwardly at the door.

At dinner, a giant’s appearance sent Saitama and Baicang racing toward the disaster zone. Baicang rode with Mizuki and Tanktop Girl, while Saitama had already left ahead of them.

• Runo called Saitama dangerous and insulted his bald head and combat suit, while Baicang tried to keep the meal peaceful.
• A news bulletin reported that a gigantic creature was approaching City B, and Baicang received a Hero Association message to help after the disaster was resolved.
• Saitama disappeared through the balcony window, and Baicang left Runo at home before heading toward the disaster site on his scooter.
• Baicang commandeered Mizuki’s motorcycle after meeting her and Tanktop Girl on the road.
• Mizuki activated the motorcycle’s extreme mode, and Tanktop Girl clung to Baicang before pinching his waist when he ignored her thanks.

Baicang reached devastated D City with Mizuki and Tanktop Girl, then set off alone to find the monster responsible for the disaster. He searched a convenience store for serum residue and, after seeing the destruction firsthand, steeled himself by remembering Saitama’s strength.

• Tanktop Girl accidentally grabbed Baicang during the motorcycle ride, and he struggled to control himself while Mizuki drove.
• After crossing the Hero Association’s cordon, Baicang leaped from the motorcycle and told Mizuki and Tanktop Girl to rescue civilians while he pursued the monster.
• Tanktop Girl stopped Mizuki from following Baicang, and Mizuki agreed to help victims and train harder.
• Baicang hurried into a convenience store, poured cold water over his head, and remembered that he had come to find serum residue.
• Baicang saw D City’s destruction, recognized the scale of the Dragon-level disaster, and regained his confidence by thinking of Saitama.