Cecilia, youngest disciple of Heiter, disgrace to the clergy. Her personal best was healing the... hangnail on Fern's hand with a Light Sphere spell.
Just as she thought she'd never graduate and was about to kill herself by headbutting a block of tofu, she transmigrated.
When she opened her eyes, a beautiful woman in butterfly clothes with a butterfly hair clip raised her hand beside Cecilia's ear and called out, "Moshi moshi~"
Cecilia was smitten.
Unfortunately, useless people are useless wherever they go. When the beautiful woman was badly injured by a white-haired man who looked like he'd been painted with oil, all Cecilia could do was shakily cast a shaky Light Sphere spell.
"Please, just save her! Save her!"
...But she missed.
That healing orb, full of love and peace, flew straight into Doma's face.
The miraculous recovery she'd imagined never happened.
Instead, there was a sizzle, and black smoke rose from Doma's handsome face as if he'd been splashed with concentrated sulfuric acid.
Doma, clutching his face: "It hurts, it hurts! What kind of deadly poison is this?!"
Cecilia, staring in disbelief: "...Huh?"
So in this world, my "heals" are poison heals?!
Much later, Cecilia learned the Breathing Style and made her Light Sphere spell bigger and better. It could heal severed limbs and save countless members of the Demon Slayer Corps who were meant to die on the battlefield, bring back the Sound Hashira, who had nearly retired in glory to live a life of marital bliss, and even turn demons back into humans so they could save their past selves and pass on with dignity.
But why are the twins she rescued along the way so clingy?
Bonus Scene:
Cecilia collapsed from exhaustion while treating the Corps members. Muichiro said, "My sister's tired. I'll take her to rest," and briskly picked her up.
Yuichiro blocked his way, looking annoyed. "What if those skinny arms and legs of yours make you drop her? Give her to me."
Cecilia opened her eyes and mumbled sleepily, "Uh... I can actually walk by myself..."
The twins said in unison, "Go to sleep/Be quiet."
Note: This is a whole-cast rescue story for the Demon Slayer Corps. The pairing is Muichiro Tokito. The twins share her, heh (they start dating normally after everyone is an adult). The heroine's priestess setting is based on Frieren: Beyond Journey's End, but has also been heavily modified by the author. You don't need to have seen the anime to enjoy this.
Theme: Live well and get plenty of sunshine.
