She does have an original story, it's called "Given" and it's available here on Mangago! Get your tissues though because it's tearjerkingly beautiful
My favorite original work is called "Links"--please read that one first, it's beautifully written!
Kizu Natsuki and Gusari are both the same person!
I agree, she's a genuine creator. She knows what she's doing and also bloody good at it on top.
This author doesn't write half-assed stories. I think the author reads alot and a poet herself/himself. He /she research alot for a source material. The author is a genius for me too. She/he knows how to play with words and it results to good stories like the Iwaizumi x Oikawa stories. I hope to read an original story from him/her