That said, I don't actually know if Kougi actually did make one comic a day since I can't find the raws.
She did.
She published the comic in twitter day by day, begining on May 10th this year, and finishing on August 25th.
Sadly, she didn't made a thread of this, so the best way to look for it is gling down the media section of her twitter
I'm looking for a manga where an author dates and dumps her love interest in order to write her next novel.
It has the line "An author sells a piece of her soul" or something like it.