"Allowance" is the sixth chapter of Hideyuki Furuhashi and Betten Court's Vigilante - My Hero Academia: Illegals manga.
In an alley, a trio of villains called the "Three Storm and Stress Brothers" steal a female's underwear by working together using their Skating Quirks. The trio continue their stealing spree of underwear which causes a mob of females to chase after them. Suddenly, Kouichi appears before them, only to get stomped on by the angry female mob. After getting away from them, Kouichi confronts the villain trio, who think that Kouichi is one of their fans due to their Quirks being similar, to which Kouichi denies. The trio state that their reasoning for their crimes is to let society out of their cage so that they can let human emotions run wild. Soon, Kouichi and the trio of villains start talking about female underwear, only to be interrupted by Pop Step who berates Kouichi for mingling with perverts. Knuckleduster appears and beats up the Three Storm and Stress Brothers, defeating them. However, they do not have black tongues, meaning they are not connected with the Trigger incidents. Seeing that there are no leads in the area, Knuckleduster decides to leave.
Back at Kouichi's penthouse, Kouichi is helping Knuckleduster train and wonders if his aloof behavior is due to the Bee Tamer from before. Knuckleduster continues training his punches and doesn't go easy which knocks Kouichi down to the ground. Pop Step criticizes Knuckleduster for over doing it, but Kouichi sees that Knuckleduster always uses his full power but not to the point of killing his enemies.
Elsewhere walking on the sideway, Quinn is speaking with her employer, the person who has been giving her the Trigger drug. Quinn's employer notes that she went overboard the other day with the Trigger drug and reminds her that Trigger is still a valuable drug that mustn't be used indiscriminately. Quinn doesn't seem to care because her employer was able to get good data from the incident. The employer states that in order for an exceptional Quirk to manifest, a strong will is absolutely necessary. The employer desires capable individuals with explosive passion in their hearts; in other words, people who are capable of pulling the "Trigger" so to speak. Quinn finds people like that a pain to deal with. Doing her job, Quinn finds a vulgar man in an alley and gives him a batch of Trigger drugs. The vulgar man injects the Trigger drugs into himself as Quinn encourages him to use his newfound power to shove it into society's face. Angry, the new Impromptu Villain uses his Trigger-enhanced might to smash Quinn into the ground. However, Quinn dodges with ease and continues encouraging the vulgar man to fight and leaps away.
The Impromptu Villain with a vulgar mouth attacks innocent civilians. Kouichi and Pop Step are on the scene. The Impromptu vulgar Villain attacks Kouichi, but he is able to quickly dodge his attacks with his Sliding Quirk. Kouichi tells Pop Step to keep the townspeople away from the villain, to which Pop Step does. The Impromptu Villain is about to attack an innocent civilian, but Kouichi manages to save him in time. Suddenly, Knuckleduster arrives and kicks the Impromptu Villain in the face. Knuckleduster suspects that the Impromptu Villain is taking the amplified power in his body and concentrates it within his fists the moment he attacks. Using this knowledge, Knuckleduster decides to fight fire with fire. Knuckleduster and the Impromptu Villain engage in a brutal fist fight, with Knuckleduster barely dodging the villain's blows by the skin of his teeth. The Impromptu Villain prepares to attack with his amplified fist, but Knuckleduster lands a powerful punch to the Impromptu Villain's face before he could unleash his enhanced punch. The Impromptu Villain has been defeated. Knuckleduster states that he used the villain's charge up time, which left him defenseless, to his advantage to perform a counter attack. Knuckleduster, despite being injured and bleeding, concludes that actual villains must have huge bodies like the Impromptu Villain he faced.
Back at Kouichi's penthouse, Knuckleduster is back to his jolly old self knowing that he can go all out against huge villains until their nearly dead since no one will complain. Knuckleduster finishes his training with Kouichi while Kouichi is happy that Knuckleduster is in a better mood.
Meanwhile, Quinn is talking to her employer about the Impromptu Villain, saying that the guy was pretty decent and notes that the trio of Vigilantes got in the way again. Quinn takes note of the old man and wonders if they should do something about them, although she doesn't care either way. However, Quinn's employer tells her that the Vigilantes are beneficial to them because thanks to them, they can gather practical data without having to worry about the Heroes or the Police Force and wants to preserve the current situation. Quinn states that the trio of Vigilantes are trying to get leads on them, to which Quinn's employer tells her that its high time for her to display her skills as a coordinator, although Quinn wonders if that is really her job before cutting off communications with her employer.
A handsome man appears before Quinn and asks if she is "Honey-Chan"; Quinn is impressed with the man's build while the handsome man comments on Quinn's cuteness. Quinn and the handsome man hold hands and walk off together.