I'm not entirely sure as I haven't read this particular light novel. It could potentially be about a character taking control of a territory ('tono' can mean territory) or some form of management within a specific context in a fictional world created in the novel.
Sorry, without knowing the exact content of 'tono no kanri o shite miyou', it's hard to recommend similar ones. But if it's about management in a fantasy setting, light novels like 'Overlord' which also involves a form of ruling and management in a game - like fantasy world could be somewhat related.
I'm not sure specifically what 'tono no kanri light novel' is about as there could be many different stories within this light novel. It might be about the management in a certain place like a manor ('tono' can mean manor) or some sort of territorial control and the events and characters involved in that.
Online platforms could be a good option. Websites like Amazon Japan might have it. They often have a large inventory of books, including light novels. Just search for 'tono no kanri light novel' on their site. However, make sure it's available in your region and that you can read Japanese if it's not translated.
The story of Will O Wisp manga is about a young person's journey into a magical world. They meet allies and foes along the way, and the plot has many twists and turns that keep you on the edge of your seat.
I'm not sure specifically as I haven't read this web novel directly. But generally, the title seems to suggest a story about falling in love with a 'villainess' (akuyaku reijo). It might involve a romantic plot within the web novel format.
It's hard to say for sure if it's popular. There are so many manga and novels out there, especially in the isekai genre. If it hasn't been widely translated or promoted, it might not be very well - known to a large audience. It could be a niche work that only certain fans of the isekai and harem sub - genres are aware of.