WARNING: The following contains spoilers for Demon Slayer: Kimetsu no Yaiba Season 2, Episode 9, "Infiltrating the Entertainment District," now streaming on Funimation, Hulu, and Crunchyroll.
Now that Demon Slayer: Kimetsu no Yaiba's Entertainment District Arc has truly begun, Tanjiro, Inosuke, and Zenitsu find themselves completely out of their element in this vast city of desire and gluttony. As the flabbergasted young Demon Slayers explore this new environment, changing Tengen Uzui from a Hashira to a babysitter, it's clear that the boys will have a hard containing their wonder and shock enough to carry out their mission. Yet surprisingly, of all people, Inosuke Hashibira adapts the fastest to the Entertainment District, making himself the most valuable of Tengen's new minions.
Inosuke was raised by a wild boar on a remote mountain, so his feral nature and uncivilized behavior seem like they should be a poor fit for this bustling city. He's so overwhelmed at first that he angrily bulldozes his way through a crowd, like a trapped animal seeking escape, forcing Tengen to chase him down. Once the group settles down in a Wisteria House, he seems to have adjusted well enough to focus on Tengen's plan. Though his skepticism regarding whether Tengen's wives are still alive gets him a fist to the gut, he accepts Tengen's assignment by disguising himself as a girl to infiltrate the house where Tengen's wife, Makio, disappeared.
Tanjiro and Zenitsu were thrown for a loop by Inosuke's unexpectedly feminine and beautiful face when they first met, but his bizarre appearance serves Tengen's purposes perfectly. Tanjiro and Zenitsu are considered quite ugly when disguised as females, but the people who take in Inosuke, aka Inoko, are delighted by "her" beautiful face when they remove "her" hideous makeup. The feral Demon Slayer has never seemed too crazy about his appearance, but he's intelligent enough to use it to his advantage now.
Inosuke's feral behavior and general impatience seem like they should make him a bad choice for undercover work. However, Tanjiro contorts his face to a horrifying expression because of his inability to lie as Zenitsu vowed to become the greatest Oiran in the city out of spite for Tengen. Meanwhile, Inosuke is quietly moving about, heeding Tengen's advice about staying silent lest his voice gives him away, and even slows his pace to a walk when he is scolded that a proper lady doesn’t run.
Inosuke's diligent work allows him to quickly pick up on a lead regarding Makio's whereabouts, while Tanjiro almost gave himself away by being too inquisitive and Zenitsu hasn't even started looking. Considering Tanjiro's dedication to any mission and Zenitsu's experience in proper civilized behavior and contemporary societies, it comes as a shock that Inosuke would find himself in the best position to actually locate one of Tengen's wives. Inosuke generally prefers solving his problems with his swords, so it remains to be seen how long he will keep up the good work before ditching Tengen's plan for his own.
It's not clear if Makio is being held in the same house that Inosuke is currently searching, but he appears to have found the first trail and it only took him one night. Perhaps Inosuke's unexpected dedication to Tengen's plan is out of admiration for the Hashira, who is very much on his level and shares Inosuke's habit of making bold declarations regarding his abilities and status. But it looks like time is running out for Makio, with no indication that Tengen's other wives are still alive. It's a race against the clock for Inosuke and the others to complete their missions before someone points out how obvious it is that they're not girls.
