[Some settings from Demon Slayer and Puella Magi Madoka Magica, with original additions. No breaking up Obanai and Mitsuri. Romance with multiple love interests (the Master and the Stone Hashira are friends only; the Sound Hashira is undecided). No one dies. Sorry for any OOC!]
While fighting witches, Nangong Xue went a little too far and smashed through the thinnest part of the barrier between Madoka Magica and Demon Slayer, ending up in the world of Demon Slayer and beginning her journey there.
Thanks to her old friends’ constant chatter, she knew a fair bit about Demon Slayer’s plot. Before they knew it, they had saved everyone from their tragic fates and forged countless bonds along the way.
[The author is writing the story they want to read. I’m a complete beginner, so if you don’t enjoy it, please leave quietly instead of posting nasty comments. I’ll delete them if I see them. The timeline is a headache, so it may differ from the original in places. Sumimasen m(_ _)m]