Demon Slayer: So, I Can Change the Past?

[No CP for the protagonist] [Happy ending] [Apologies for any out-of-character moments] (The main story is complete.) Updates with watch-along chapters and extras are in progress. Shu Yu transmigrates into Demon Slayer. Since the System gives her so many benefits, she decides to complete the missions to change the pasts of the nine Hashira and six youngsters, and help them defeat Muzan. This time, they won’t be trapped in the mire of the past. They’ll have happy futures. When faced with Kotoha’s husband and mother-in-law, Shu Yu says, “This is a robbery!” Watching the Shinazugawa brothers’ conflict, Shu Yu reveals Sanemi’s secret to Genya Shinazugawa: “Trust me, your brother loves you so much.” The brocon immediately blows his top. When Shu Yu encounters the tasteless guy who insults Mitsuri, she lets loose on him right away. Shu Yu visits Tanjiro’s home, and after taking Nezuko out for a bit, she discovers the Blue Spider Lily. After changing the past, Shu Yu starts helping them change the future, too. Death is off the table. You’re all going to live. The Demon Slayer Corps heads into its most well-funded battle yet. Shu Yu points to the dozen or so Hashira in the courtyard and says to Kagaya Ubuyashiki, “Look, this is the kingdom I won for you.” As they spend time with Shu Yu, everyone gradually comes to love this eccentric but kind-hearted girl. Later, there will be watch-along chapters featuring both humans and demons.