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Hey, I'll let you in on a little secret... once you go monster, you can never go back.
— Nyan introducing himself.

Puri-Puri Prisoner vs. Nyan was the fight between the S-Class hero Puri-Puri Prisoner and the Monster Association executive Nyan.


While the prisoners of Smelly Lid Prison attack Puri-Puri Prisoner, Nyan comes in from behind the hero. Nyan tells him that once someone becomes a monster, they can never go back.


Before Puri-Puri Prisoner can even react, Nyan slashes the hero across his chest with minimal effort, yawning in the process. He attacks the hero again with his Feline Retribution, drawing up large portions of blood and ripping Puri-Puri Prisoner's sweater apart.

Nyan slips through a crack in the wall

As Puri-Puri Prisoner evolves during the battle and attempts to forcibly shower the prisoners with love, Nyan begins to feel uneasy. This is because he was once a house cat, and his former master would constantly shower him with unwanted love. Not wanting to deal with a similar foe, the monstrous cat decides to retreat and manages to slip through the crack in the wall. Puri-Puri Prisoner does not understand how Nyan could do this, and the monster replies by saying he can pass through any gap larger than 3 millimeters, and since there are so many cracks, he can easily travel around the Monster Association Headquarters.

Despite his retreat, Puri-Puri Prisoner does not allow Nyan to run away like this, and so he decides to increase the power of his vibration with his bristle armor on his forearms. The hero dives into the concrete like a swimmer and uses his Angel ☆ Crawl to chase after Nyan. Nyan notices this and enters another crack in an attempt to lose the hero. Alas, Puri-Puri Prisoner is still determined to chase him to the ends of the Earth and catches up with Nyan. They come across the prisoners again, with one of them asking Nyan if he killed Puri-Puri Prisoner.

From above, Puri-Puri Prisoner comes crashing down, and he accidentally crushes the prisoners and kills them with his Angel ☆ Crawl. Puri-Puri Prisoner mourns the death of his fellow prisoners, but quickly focuses his attention on Nyan and prepares to fight the Dragon-level monster and avenge the deaths of the prisoners.

However, by this point, Nyan has already retreated outside of Puri-Puri Prisoner's vision, going to search for other heroes to fight. Puri-Puri Prisoner does not get this, however, because he is the weakest of the S-Class heroes, and as he walks through the headquarters to search for more monsters, he states that Nyan will regret fighting whichever hero he comes across next.


After Nyan retreats through the cracks of the headquarters, he comes across Saitama and attempts to strike him with a surprise attack. However, he is shocked to realize the attack had no effect, and immediately retreats again.


  • This battle initially happened in Chapter 105. However, after being redrawn, the battle was moved to Chapter 112.


Monster Association Arc
Manga Chapters 78798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154
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
Fights 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. OrochiTatsumaki 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 & OrochiHeroes vs. Psykos and OrochiHeroes vs. Monster Association ExecutivesGarou vs. BombGarou vs. Bang