Puri-Puri Prisoner vs. Prisoners of Smelly Lid Prison

Puri-Puri-Prisoner vs. Prisoners of Smelly Lid Prison is the battle among the S-class hero Puri-Puri-Prisoner and the newly recruited members of the Monster Association who were formerly prisoners of the Smelly Lid Prison.

Preview
As Puri-Puri-Prisoner finishes eliminating Vacuuma, the prisoners of Smelly Lid Prison comments on that he's a monster among monsters and that they can no longer think of him as human. They remember all of the time they tried to cut his head off while he was sleeping, but his skin was so tough that no razor blades could pierce it. The monsters eagerly prepare their revenge and declare the hero as their sworn enemy. Puri-Puri-Prisoner recognizes those voices and is shocked that the prisoners were captured and transformed them into monsters. He also is sickened that they monsterfied such weak men, enraging the monsters for calling them weak and causing them to charge the hero.

Battle
As they all blitz Puri-Puri-Prisoner, each of them speaks and talks about the punishment they endured in their prison. One of them says they will go back to the prison and kill the guards, while another says that the Deep Sea Kiss punishment was absolutely unforgivable, adding onto this by saying they would've been legendary serial killers if it wasn't for him. Puri-Puri-Prisoner is saddened that the prisoners had their hearts corrupted after becoming monsters, although the prisoners assure him that they've always hated his guts. Puri-Puri-Prisoner is shocked by this, and tells them to remember all of the memories they made together. Unfortunately, the prisoners are not moved, causing Puri-Puri-Prisoner to tear up, as he still loves the prisoners and is determined to save them. Then, out of nowhere, a monster appears from behind Puri-Puri-Prisoner and tells him that once someone becomes a monster, they can never go back. This monster is revealed to be Nyan, and 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.

The prisoners are amazed by Nyan's power and rush Puri-Puri-Prisoner while he's distracted, but the hero gets back up and tells the monsters that as long as they have a human heart, they will always be fine humans. He continues by proclaiming that he will rescue his boyfriends, and that with love, nothing is impossible. The prisoners are shocked that their words are still not getting through to him, and they attack him once again, although this time, he does not attempt to defend himself and takes the attacks with no damage. Nyan notices this, and realizes the accumulated damage awakened his defensive instincts, so his body rapidly as a result. At first, Puri-Puri-Prisoner wonders if he grew angel wings, but one of the prisoners tells him it's just body hair, which has improved his defenses. The hero calls this new defense Angel ☆ Bristle Armor, and with his heightened defenses, decides to attack Nyan, since the attacks from the prisoners now do no damage to him. Surprisingly, Nyan does not attack, but instead, begins to feel dread creeping up his spine. 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 of the wall. Puri-Puri-Prisoner doesn't 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 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 sees this and falls to the ground, agonizing over their deaths with tears in his eyes. He quickly recovers from the grief of their losses, using his anguish as rage to use against Nyan. He accepts his new technique as a gift from all of them and thanks them, while the body hair falls off of his body. The hero declares their deaths will not be in vain, and he prepares to eliminate Nyan, while one of the prisoner's last thoughts is cursing at him before he succumbs to death.