Wielding Sound as a Blade, I'll Blast the Infinity Castle

Hold on, read a few chapters before you decide. [Demon Slayer × Female protagonist × Everyone survives × System × A little absurd] Apologies for the out-of-character moments, and there are some original settings. One day, Mu Wanshi opens her eyes to find herself in the pleasure quarter of Yoshiwara, about to serve tea and wine, when the shadow of a demon’s claw suddenly falls over her! At her most desperate moment, the System arrives with supernatural powers, helping her master the strings and become the Demon Slayer Corps’ astonishingly talented Tsuguko of the Strings. The rousing song “Against the War” rings out, its fiery melody turning the battlefield upside down and igniting the team’s fighting spirit. The tender, lingering strains of “Leave My Dependence” flow forth, dissolving Akaza’s obsession and letting him fade away beneath the light of day. The cool, clear “Moonlight” pierces the air. The music cuts like a blade through Kokushibo’s thousand-year-old inner demons, bringing an end to his tragic pursuit of the light. And then there is “Warm,” played and softly sung, its gentle notes washing over their wounds and bringing a healing glimmer to the blood-soaked battlefield. As her fingers dance across the strings, demons and monsters vanish. System rewards rain down one after another, astonishing the Hashira. Watch as Mu Wanshi wields strings as blades and music as her edge, writing a legend of slaying demons through song! While everyone else slays demons with Breathing Styles, Mu Wanshi relies on the System. In the Infinity Castle, as she faces Doma, Shinobu is still trying to poison him and Kanao is still gathering her strength, when Mu Wanshi pulls out a comically out-of-place rocket launcher. With a thunderous boom, Doma is instantly taken out. Tanjiro: “Is that thing even stronger than a Nichirin Blade?” Zenitsu: “Wanshi, you’re so cool!” Inosuke: “I’m following you from now on!” Mu Wanshi slides down her sunglasses and declares arrogantly, “Stick with me and you’ll never lose your way. I’ll make sure you reach the end safe and sound!”