I'm not sure about the most popular ones off - hand. But there could be some niche works that are well - loved within the genre fans. You might need to search in specialized Japanese literature or anime - related forums to find out.
It's hard to say for certain which are the popular 'isekai onsen ni tensei novel' works. There are so many novels in the isekai genre in general. However, some works that combine elements of reincarnation and unique settings like onsen might be out there. You could try looking at review websites for Japanese novels or asking in fan communities dedicated to isekai stories.
I'm not entirely sure specifically as there could be many different stories within this genre. Generally, 'isekai' often involves being transported to another world, 'onsen' is a hot spring, and 'tensei' might refer to reincarnation in a novel context. So it could be about a character being reincarnated in a world with hot springs.
Some popular ones might include 'Isekai Onsen ni Tensei: My New Life as a Hot Spring Owner'. It's a common concept where the protagonist is reincarnated in an isekai world related to hot springs and has various adventures.
I'm not entirely sure as I haven't read it specifically. But generally, 'isekai' often involves a character being transported to another world, and 'onsen' is a hot spring. Maybe it's about a protagonist who is reborn in an onsen - related other world and his adventures in that world as a light novel story.
The concept of reincarnation. It gives the protagonist a chance to start anew, often with some kind of special ability or knowledge from their previous life. In the context of an isekai onsen, they can use this to their advantage in the new world, whether it's for building a successful onsen business or for dealing with the various challenges and mysteries in the world. For example, they might know a special recipe for a healing onsen water that was popular in their old world but new in this isekai. And the onsen itself can be a place for all kinds of social interactions, from making friends to political intrigue if the world has that sort of structure.
I'm not entirely sure as I haven't read this novel specifically. But generally, 'isekai' often involves being transported to another world. 'Onsen' is a hot spring. So it might be about a protagonist who is reborn in an onsen in another world and their adventures or experiences there.
I'm sorry, I don't know the specific main characters in this light novel as I haven't read it.
You can try looking for it in local bookstores that specialize in Japanese novels or manga - related books. Sometimes they carry unique and hard - to - find titles.
I'm not aware of a specific work titled exactly 'isekai ni kita novel' being extremely popular. But there are many popular isekai novels in general, like 'Sword Art Online' which has some elements of being transported to a different world.
Well, the title 'tensei ni hakobijin no isekai kouryakuhou novel' gives some clues about the novel. 'Tensei' usually refers to reincarnation, which is a common trope in isekai stories. 'Hakobijin' could be some sort of important figure in the story. The 'isekai kouryakuhou' might suggest a strategic or planned adventure in the other world. Without reading it, we can only guess that it may have a story full of fantasy elements, with the protagonist using their new - found identity or abilities in the isekai world to face various challenges and grow.
One popular 'isekai tensei ni kansha wo' light novel could be 'That Time I Got Reincarnated as a Slime'. It features a unique story of a man being reincarnated into a slime in another world and building his own kingdom. Another might be 'Overlord', where the protagonist is transported to a game - like world. There's also 'Re:Zero − Starting Life in Another World', which is known for its time - loop mechanic and complex character development.