
Volume 4 of One-Punch Man tucks in Prison as a bonus story. It drops Speed-o'-Sound Sonic into the infamous Smelly Lid Prison, where he learns the hard way that the hero quietly running the cellblock is nobody the inmates dare cross.
Locked into a suite of custom gadgets built by the Hero Association, Sonic is marched to his cell and dropped inside the Smelly Lid Prison, which houses the vilest offenders. The veteran inmates try to toy with the new arrival, only to grasp far too late that they have picked the wrong man.
Sonic warns the whole cellblock that he means to slaughter every one of them so his sentence will not bore him, and the furious convicts line up to face him one by one. Their rowdiness rattles the prison's true ruler, at which point everyone but Sonic scrambles to behave. That ruler proves to be the figure who imposed order on the place and drilled the rest into obedience. The Smelly Lid Old Man clues Sonic in: the boss, Puri-Puri Prisoner, is gay and turned himself in on purpose so he could 'lawfully' get close to other men.
Once the lecture wraps up, a news report warns Puri-Puri Prisoner that Stinger is in trouble, and he sets off to save him. He punches a gaping hole clean through the prison wall to break out, and Sonic ducks through the same opening to make his own escape.
In the bonus chapter Prison, Speed-o'-Sound Sonic is the newly arrived inmate dropped into the Smelly Lid Prison. The cellblock's true ruler, however, turns out to be Puri-Puri Prisoner, who imposed order on the place and drilled the other convicts into obedience.
Prison shows Puri-Puri Prisoner is strong enough to punch a gaping hole clean through the prison wall in order to break out and go save Stinger.
Prison drops Speed-o'-Sound Sonic into the infamous Smelly Lid Prison, where he learns the hard way that the hero quietly running the cellblock is nobody the inmates dare cross.
In Prison, the inmates fear Puri-Puri Prisoner because he has imposed order on the cellblock and drilled the rest into obedience. The Smelly Lid Old Man explains that Puri-Puri Prisoner is gay and turned himself in on purpose so he could get close to other men.
Sonic escapes Smelly Lid Prison in the chapter Prison after Puri-Puri Prisoner punches a hole through the prison wall to rush off and save Stinger, and Sonic ducks through the same opening.
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