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.
It's difficult to say whether 'isekai meikyuu de harem wo light novel' is popular. While the isekai genre as a whole has a large following, not all titles within it gain widespread popularity. The concept of a harem and a maze in an isekai world might appeal to some fans of the genre, but it also depends on how well the story is written, the character development, and the marketing of the novel.
It's difficult to determine its popularity. Some light novels in the isekai and harem genres become very popular due to their unique storylines, characters, or marketing. However, without any specific data on sales, reviews, or fan communities, we can't really say if 'isekai meikyuu de harem o light novel' is popular.
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.
One popular harem isekai light novel is 'In Another World with My Smartphone'. The protagonist is transported to a fantasy world with his smartphone and soon finds himself surrounded by various female characters. Another is 'Overlord', where the main character, Momonga, is trapped in a game world and has interactions with different female npcs that could be considered part of a harem - like situation. And 'The Rising of the Shield Hero' also has elements of harem isekai, with the main character, Naofumi, gradually gathering a group of female companions during his adventures in the isekai world.
If you're new to isekai harem light novels, start with 'No Game No Life'. It has an interesting concept and the harem aspect is more about the relationships based on the game - playing. 'High School DxD' is also a popular choice, but it has some more mature themes, so be aware. However, the story is exciting and the harem is a big part of the plot.
Well, 'isekai meikyuu de harem wo light novel' could be about a story set in an isekai world. Maybe the protagonist finds himself in a mysterious maze (meikyuu) in this new world. The 'harem' part suggests that there will be multiple characters, perhaps of the opposite sex, involved in the story. It could be a tale of the main character's journey through this maze while dealing with relationships within the harem.
I'm not entirely sure as I haven't read it specifically. But generally, 'isekai' often involves a character being transported to another world. 'Harem' usually implies a story where the main character is surrounded by multiple characters of the opposite sex in some kind of romantic or close relationship context. And a 'light novel' is a type of Japanese novel often with illustrations.
Well, for one thing, the isekai tensei concept allows for a fresh start in a completely new and often fantastical setting. This gives the author a lot of room to create unique worlds, magic systems, and species. The harem part is appealing because it offers different types of relationships and character dynamics. Different characters in the harem can have their own personalities, backstories, and growth arcs. For example, in some novels, one girl might be the strong and silent type, while another is the bubbly and energetic one. The protagonist then has to navigate these different relationships, which adds depth and variety to the story. Also, it can appeal to different reader fantasies about love, friendship, and adventure all rolled into one.