Yes, there are several. For example, 'Fruits Basket' has a complex web of relationships and a touch of romance similar in some ways. The story involves different characters with their own secrets and how they interact with the main character, much like in 'kyou kara maou' where the relationships are multi - faceted.
I'm not sure specifically as I haven't read this web novel. But generally, it could be about a story of love related to a certain type of female character (akuyaku reijo) in a web - novel setting.
I would also recommend 'Akatsuki no Yona'. The relationship between Yona and her companions, especially with Hak, has a romantic aspect that is similar to 'kyou kara maou' in the sense that it is built on trust, mutual understanding, and shared experiences. As the story unfolds, the romance deepens in a natural and engaging way.
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.
Here are a few recommended end-of-the-world Koi manga novels: " The Female Lead Becomes the King of the Apocalypse ": The story of the female lead and all kinds of cannon fodder male and female supporting characters fighting together to become the queen of the apocalypse. 2. " The Book of the End of the World: I Become the Female Lead of the Little White Flower ": The female lead transmigrated into the former female lead of the novel and started the story with the male leads.