Tanjirou intensifies his Constant Concentration Breathing, asking the three little girls (named Naho, Kiyo, and Sumi) to slap him with carpet beaters if he breaks the breathing in his sleep. I love how the girls are rooting for him all the way, and will gladly do what appears to Zenitsu and Inosuke to be straight-up torture.
It may be torturous, but it goes a long way toward Tanjirou making progress. He’s definitely getting closer and closer to tagging Tsuyuri Kanao, who we can be quite sure isn’t going easy on him, while he’s eventually able to break the Lv. 1 Gourd with his breath.
Soon Inosuke and Zenitsu grow weary of falling too far behind. Also, Shinobu knows exactly how to motivate each of them: in Inosuke’s case, talking down to him and saying it’s okay to be weak; in Zenitsu’s case, batting her lovely eyelashes and saying she believes in him.
Shinobu also asks Kanao to get more involved in the boys’ intensifying training, but seems weary of approaching them, leading to her taking out a coin to flip. We learn how she came to rely on that coin for most of her decisions, but first we learn where she came from: nothing. She was dirt-poor and horribly abused by her parents until she one day just snapped and couldn’t feel pain—or anything—anymore.
One day her parents sold her off, and her buyer is preparing to sell her into slavery when they cross paths with Shinobu and her big sister Kanae (Kayano Ai). Disturbed by the sight of the young girl bound by rope, Shinobu tosses all of the cash she’s carrying up in the air and runs off with the unnamed girl.
Eventually Shinobu learns that Kanao was so horrifically traumatized by her life so far that she’s unable to do anything without being told to do it, even eat, resulting in her stomach grumbling far longer than it should. Kanae gives the newly-named Kanao a coin so she can make decisions for herself. Kanae also hopes that one day she’ll fall in love with someone, which will further help her understand her own agency and will. Back in the present, she gets tails, and doesn’t join the boys.
However, as a result of Tanjirou’s intensive training, one day he’s finally able to not only grab Kanao’s hand during tag, but win the cup game, all without splashing tea on her. It’s a stunning victory, and while Kanao never actually speaks to Tanjirou, you can tell she’s impressed by his progress.
After Haganezuka and Kanamori arrive at the mansion with Tanjirou and Inosuke’s reforged swords (and Inosuke re-chips his up with a rock, enraging the swordsmiths), Shinobu declares Tanjirou’s jaw healed and training complete. All that’s left is actual combat, and she tells him she’s expecting great things. As we saw back when she rescued Kanao to how she’s guided Tanjirou, it’s clear by now that Shinobu is definitely one of the good ones.
Interesting, she doesn’t know anything about the “fire breathing” Tanjirou brings up, only the distinct flame breathing in which Master Rengoku specializes, though he’s away on a mission, so more info on that will have to wait. Meanwhile, we see a Twelve Kizuki demon aboard a train eating its occupants—an apparent preview of the hugely popular October 2020 feature film Mugen Train.