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"Backpack" (ランドセル, Randoseru, Tonari: 138) is the 100th chapter of the One-Punch Man manga series.


Child Emperor is walking down a passageway and monitoring what the other heroes are doing. He notes that Flashy Flash's transmitter seems to have failed. A monster tries to ambush him only to be shot dead by one of Child Emperor's robots, Mini Octotank No. 8.

He then finds the remains of the destroyed Metal Knight robot and notes that someone appears to have attempted to reassemble it and has dissembled some parts with real expertise. He is concerned that there may be robotics experts working with the Monster Association and the technology that was developed to fight monsters may end up being used against heroes themselves. He then decides to try salvaging some information from the remains of the robot in hopes of finding out where the hostage, Waganma, is being held. The robot yields a detailed map showing where the hostage is held and Child Emperor is angry that Metal Knight has refused to share this information despite knowing it. He calms himself and unwraps a sweet to eat when he realizes that Octotank has been destroyed by Phoenix Man, who asks if he was here to play.

Phoenix Man monologues about his role within the Monster Association and his backstory before attacking Child Emperor, only to run hard into an invisible shield. As the monster reels in pain, Child Emperor notes that this was a lightweight shield that he'd developed and which could be folded and even wrapped around sweets. He then executes Phoenix Man with an array of tools that spring out of his backpack.

He rescues Waganma by gassing the monsters guarding the hostage's cell while protecting Waganma with a frog-themed gas-mask. As they are about to leave the cell, Sludge Jellyfish oozes in and attempts to crush Child Emperor, only to realize that this is unsuccessful as Child Emperor has put up a shield generated by his umbrella. He tries to cut up Sludge Jellyfish before defeating the monster by dousing it in liquid fuel and setting it alight.

As the two of them escape, he notes that something appears to be up ahead and sends a toy tank as a sentry. The tank is destroyed and Machine God G5 appears. Child Emperor attempts to disable the machine using a high voltage cage and a jamming signal, but G5 defeats it easily. The chapter closes with the machine approaching the pair of them menacingly.

Characters in Order of Appearance[]

Chapter Notes[]

Online Cover


  • The japanese title, actually refers to a specific type of backpack, the Randoseru.
    • A randoseru (ランドセル) is a firm-sided backpack made of stitched firm leather or leather-like synthetic material, most commonly used in Japan by elementary schoolchildren. Traditionally it is given to a child upon beginning his or her first year of school, whereupon the child uses the same bag until grade 6.
      • The word "Randoseru" comes from the German word Landser which means a soldier. The German Army provided the second wave of military advisers to the Meiji government, resulting in the Japanese Imperial Army adopting much of its practice, so it is highly likely that the infantry backpacks were also adopted at the time. Being adopted at the elite schools, the bags filtered down throughout Japan, eventually taking its current form and name.


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Volume 2
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Volume 4
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Volume 6
Volume 7 353637Extra 1Extra 2Extra 3
Volume 8
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Volume 10
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Volume 12
Volume 13 68697071Special
Volume 14
Volume 15 7677787980Extra 1Extra 2Extra 3
Volume 16
Volume 17 858687Extra
Volume 18
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Volume 20
Volume 21 979899100101Extra
Volume 22
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Volume 24
Volume 25 119 • 120 • 121 • 122 • 123 • 124 • 125 • Extra
Volume 26
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Monster Association Arc
Manga Chapters 78798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
Manga Volumes
Webcomic Chapters 53 • 54 • 55 • 56 • 57 • 58 • 59 • 60 • 61 • 62 • 63 • 64 • 65 • 66 • 67 • 68 • 69 • 70 • 71 • 72 • 73 • 74 • 75 • 76 • 77 • 78 • 79 • 80 • 81 • 82 • 83 • 84 • 85 • 86 • 87 • 88 • 89 • 90 • 91 • 92 • 93 • 94
Pre-Raid Battles

Garou vs. Death Gatling's GroupGarou vs. GenosGarou vs. Bang and BombGenos, Bang and Bomb vs. Elder CentipedeKing and Saitama vs. Elder CentipedeGarou vs. Royal Ripper and Bug GodGarou vs. Royal RipperGarou vs. Unihorn, Showerhead and Super MouseGarou vs. Overgrown RoverGarou vs. Gyoro GyoroGarou vs. Orochi

Monster Association Raid Battles

Tatsumaki vs. Evil EyeHeroes vs. Rhino WrestlerFlashy Flash vs. Gale Wind and Hellfire FlameChild Emperor vs. Phoenix ManChild Emperor vs. Sludge JellyfishChild Emperor vs. G5Child Emperor vs. Phoenix Man: Round 2Zombieman vs. PurebloodPig God vs. The Great Food TubAtomic Samurai's Disciples vs. Do-S and Narinki's Private SquadSweet Mask vs. Do-S and Narinki's Private SquadAtomic Samurai's Disciples vs. Devil Long HairPuri-Puri Prisoner vs. BaqumaPuri-Puri Prisoner vs. Prisoners of Smelly Lid PrisonPuri-Puri Prisoner vs. NyanSuperalloy Darkshine vs. Bug GodSaitama vs. Overgrown Rover and NyanTatsumaki vs. PsykosSaitama vs. OrochiAtomic Samurai vs. G5Atomic Samurai vs. Black SpermZombieman vs. Homeless EmperorSweet Mask vs. Fuhrer UglyPig God vs. GumsAtomic Samurai's Disciples vs. Evil Natural WaterGarou vs. Puri-Puri PrisonerHeroes vs. NyanDrive Knight vs. NyanGenos vs. G5Garou vs. Superalloy DarkshineChild Emperor vs. Evil Natural WaterBang, Bomb, and Fubuki vs. Overgrown RoverTatsumaki vs. Psykos & Orochi

Surface Battles

Heroes vs. Psykos and OrochiHeroes vs. Monster Association ExecutivesGarou vs. BombGarou vs. BangGarou vs. Monster Association ExecutivesGarou vs. Flashy Flash vs. Platinum SpermGarou and Metal Bat vs. Sage Centipede and Evil Ocean WaterSaitama vs. Evil Natural WaterSaitama vs. Awakened GarouBlast vs. Awakened Garou