Mitsuru
Mitsuru (last name unknown) works as Shigure Sohma's editor—a job that's basically a masterclass in stress management. Shigure calls her Mit-chan, which she probably doesn't find as endearing as he thinks it is.
She's perpetually exhausted and anxious, which makes sense given that her entire job revolves around chasing down a writer who either misses deadlines on purpose or vanishes right when his work is due. Shigure clearly gets a kick out of tormenting her, claiming he hasn't finished manuscripts when he obviously has, or just. leaving town. It's become kind of his thing.
The funny part is that despite constantly falling for his excuses, she never actually learns. Some might chalk this up to her being scatterbrained, but honestly, it's probably just that Shigure is genuinely unpredictable enough to keep her guessing. Her stress levels have gotten so bad that she's made several (played for laughs) suicide attempts over his antics. Her boss usually steps in at those moments to remind her that Shigure's just messing with her again—which, to be fair, he always is.
Content compiled by AnimeList.moe from publicly available sources.