Checking the WN version, the author's only written 4 arcs so far. https://ncode.syosetu.com/n8418ff/
Story is still ongoing, but the infrequent updates (1 new arc every 2-9 months) suggests this is more like a side project for the author when they don't want to work on Mushoku Tensei.
Someone on Reddit found Castle-nim's source.
https://old.reddit.com/r/OtomeIsekai/comments/limgpl/found_the_asset_where_castle_nim_is_from/
Another tried to purchase from the Korean website, but the asset makers had to refuse the purchase due to "product management difficulties" and that "their...
What's ironic is that MC is experiencing nearly the exact same situation that befell her ex-fiancee - in exchange for an influential noble's support for the throne, she must take his son as her consort.
I can see where the harem would fit in now; not wanting the nobles to take advantage of her...
@reece410 Novel version goes deeper into Ariel's bitchiness. Remember how one of Ariel's maids, Rachel, tried to harass MC in the previous chapter?
@reanseih The way it was written in the novel,
Aria living up to the villainess tag, unlike the usual "misunderstood villainesses who are actually good and pure".
sideglancing at most Japanese otome villainess works
@DerpySausage Iirc the source webnovel/light novels are already complete. However I think the manga is still only covering Vol 1 of the LN.
Series has 8 LN volumes. https://beans.kadokawa.co.jp/product/series46/