Relationships in general are probably a key theme. This includes not just romantic relationships but also friendships and how they interact with the main plot.
One similar light novel could be 'Toradora!'. It also features complex relationships between characters in a school setting, much like 'fuufu ijou koibito miman light novel'.
Since I don't have detailed knowledge of 'watashi ga koibito light novel', it could potentially be about a love story. Maybe it tells the tale of a protagonist's search for love, their encounters with different people, and how they navigate the complex emotions that come with falling in love. It might also include elements of Japanese culture and society as light novels often do.
I'm not sure specifically as I haven't read this particular light novel. It could potentially be about a character who has some extraordinary skill beyond the normal state of things, given the words 'jouji ijou skill' which might imply a supernormal ability in an abnormal frame.
Some specialized Japanese or Asian bookstores might carry it. Also, you can look into second - hand bookstores, as sometimes they have rare or hard - to - find light novels. Another option is to check with local libraries. If they have it, you can borrow it first to see if you like it before buying.
I'm not sure as I haven't read this particular light novel. But generally, from the title, it might explore themes of love and betrayal. 'Netorare' often implies a situation where one's partner is being taken away, so it could be about the emotional turmoil that comes with such a situation in the context of a romantic relationship.
I'm not sure specifically about light novels exactly like 'koibito o netorare light novel'. However, some popular light novel series that often deal with relationship themes are 'Sword Art Online' which has complex relationships among the characters within a virtual world setting. Another one could be 'Re:Zero − Starting Life in Another World' where the main character has various relationships with different people in the new world he is in.
Given that we don't have a clear understanding of the exact themes in 'hazure waku no joutai ijou skill light novel', it's a challenge to recommend precisely. But if it has elements of characters with extraordinary skills in an interesting setting, you might like 'Log Horizon'. In this light novel, the characters use their skills and knowledge to navigate a virtual world. There are also elements of strategy and development related to their abilities which could potentially be similar to what the unknown light novel might offer.
Self - discovery could be a theme as Shirayukihime deals with her relationships with the seven. She might learn more about herself through these interactions.
I'm not very familiar with 'shirayukihime to 7 nin no koibito web novel'. It might be a relatively niche web novel. Maybe it's about a character named Shirayukihime and her relationships with seven lovers, but this is just speculation without further research.