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.
Well, without having read it specifically, it could be that the 'isekai meikyuu de harem o manga novel' is centered around a male protagonist who is transported to a maze in a different world. In this maze, he encounters various female characters, which form a harem around him. The story could then follow his adventures in this strange new world, trying to survive the maze while also dealing with the complex relationships within the harem. It could also involve elements of fantasy, such as magic or special abilities that the protagonist and the harem members possess.
The harem aspect means there are multiple female characters who are attracted to the MC. In these manga, the relationships can range from simple admiration to deeper emotional bonds. The female characters often have diverse personalities and abilities, adding to the complexity of the story. For instance, in 'Death March to the Parallel World Rhapsody', the harem members include a princess, an elf, etc.
There's also 'Death March to the Parallel World Rhapsody'. The MC Ichirou Suzuki is overpowered and gradually builds up a harem of various characters in the isekai setting. The story has a mix of adventure, comedy and some harem elements.
For me, 'That Time I Got Reincarnated as a Slime' stands out. The world-building and plot development are really engaging. Also, the characters have a lot of depth.
Well, it's a bit hard to pinpoint exactly which was the very first one. But some early examples could include 'El-Hazard: The Magnificent World', which had elements of the isekai genre.
Well, 'Konosuba: God's Blessing on this Wonderful World!' is a must - mention. Kazuma is reincarnated in a fantasy world and teams up with a group of misfits, including some female characters who form a sort of harem around him. It's known for its humor and unique take on the isekai genre with harem elements.
Isekai Quartet indeed has a manga. It offers a different perspective and sometimes delves deeper into the story compared to the anime. The manga can be a great companion to the animated version for fans wanting more of the Isekai Quartet world.
Here are some recommended fantasy harem manga novels:
1. " The Empress's Harem ": This was an ancient harem manga about love. It told the story of the empress in power and the male concubines fighting for favor. The female lead was an overbearing female CEO who had transmigrated into the world of female idols. When she woke up, she had seven husbands. Not only did she have to protect herself in the power struggle, but she also had to deal with complicated emotional entanglements.
2. " Nine-Turn Chaos Technique ": This is a fantasy harem novel from another world. The story is full of infinite possibilities and surprises. Every twist makes one's blood boil, and every fortuitous encounter makes one fascinated.
3. " I am the God of King Zhou's Pride ": This is an old book, but it is still an excellent harem novel. The story told the story of the apotheosis, and it was a harem novel that traveled at a very fast speed.
4. " Senior Sister, I Don't Want to Work Hard Anymore ": This was a rather straightforward fantasy harem novel. The male protagonist joined a sect that was full of female cultivators at the beginning of the story. The number of female protagonists in the later parts of the story was even more ridiculous. It was a fantasy harem novel that guaranteed driving.
Please note that the above recommended fantasy harem manga novels are based on the search results provided. There may be other related works.
One popular one is 'The Rising of the Shield Hero'. It features a unique isekai setting where the protagonist is summoned to another world as the Shield Hero, and gradually forms a harem of diverse characters throughout his adventures.