The sixth volume of this is out soon and I'm reading the author's new novel, Lady Estelle's Esteem...she's the real deal and I'm convinced she can make anything work.
A few corrections: There's a lot of misinformation about LN target demos. This is published by the same label as Dahlia...and Mushoku Tensei. They clearly publish for both male and female audiences on the grounds that books are for everybody.
I'd argue the wizard's name should be Felix. The title...really only fits the first book, so we might want to tinker with it a bit. Is a Long Term Arrangement Possible? might work better for a series where she's only a housekeeper in one volume.
It's also just not a tearjerker, that is the most out -there characterization I've ever read. They do certainly discuss the difference in lifespans but the tone is anything but a weeper. It's all about slowly getting to know each other and finding new things to admire. And that one time she got turned into a cat.
Can't recommend it enough. As someone who never reads romance novels, I only grabbed these because Miya (Bookworm) Kazuki said I should, and they just immediately won me over, and honestly have only gotten better as the series goes on.