Arc 1Chapters 2–26
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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 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.
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.
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 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 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 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 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 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 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.
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.
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.
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.
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 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 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 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 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.
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.
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.
Baicang searched for the giant after its fight with Saitama, but stopped to rescue people and got delayed by their requests. When a man tried to guilt him into staying, Baicang tricked the crowd into letting him leave and discovered the man worked at Chiba Bank.
Baicang hurried through the disaster zone while Fubuki and the Fubuki Group searched for a missing girl and encountered a Mole Monster. As the monster overwhelmed Fubuki, Baicang arrived, rescued her, and introduced himself.
Baicang rescued Fubuki from the Mole Monster and then returned with the lost Xiao Cai. After Fubuki reunited Xiao Cai with her group, Baicang fled when the girl began reaching for him and threatening to cry.
Baicang reached the cordon around the giant’s corpse, where Bang approved of his feigned heroic motives and accompanied him inside. They arrived at the enormous body, while Bang wondered which hero had defeated it.
Baicang rejected Bang’s offer to teach him Water Stream Rock Smashing Fist after seeing the giant’s body and deciding he would not risk the potion’s apparent cost. He returned home to find Saitama had eaten the hot pot and spent the evening watching television with Baicang and Runo.