I'm looking for some Interesting Novels where the MC's "cheat" is the ability to Freely travel between 2 or more worlds (doesn't necessarily have to be Earth). A Big aspect here is that I want something where the MC isn't just having a good time, but is actively exchanging culture and other things between the worlds to their own advantage. Doesn't necessarily have to be NU, can be RRL or the like as well. Though if its not either of those, only if its quality is good. Examples: Porter of Two Worlds Takarakuji de 40-oku Atattandakedo Isekai ni Ijuu Suru Netooku Otoko no Tanoshii Isekai Boueki (WN) Going Back and Forth Between Earth and The Other World with Space Time Magic Isekai Quest After School! Saving 80,000 Gold in an Another World for Retirement The Empress’s Gigolo Gate – Jietai Kare no Chi nite, Kaku Tatakeri Outbreak Company NOTES: 1): Decent Length (100+chapters or 2-3 Volumes, depending on chapter length), and/OR being actively translated (Has been updated in the last 1 - 2 months). I.E. I don't want something with 10-15 chapters that's not been updated since August 2016, but something with 5-10 chapters that's been update Mid May/June (or even the start) is perfectly fine. 2): No Hentai/Smut. Adult themes/Scenes are fine, but no blatant smut (I.E. a bedroom scene just for the sake of smut). 3): Harem tag is fine, but No Polygamy. 4): No BL/GL.
Dimensional Sovereign. Sadly, there's polygamy and not much cultural exchange. It's completed, though, so there's that. Outbreak Company. This one's basically what you're looking for. Though, I'm not sure if the protagonist goes through polygamy since I dropped it early on. The english translations are licensed, but there are around 14 translated volumes in J-novel. Serial Experiments lain (Anime/VN). Hear me out: Lain basically has the ability travel to the digital world and "exchange" cultures, maybe religion while she's at it. Speaking of digital world, the Digimon franchise should be a given, right? Randidly Ghosthound (RRL). If I remember correctly he was the first earthling to be able to visit other worlds (it happens on the middle portions of the story), it's also a bit of kingdom building so there's bound to be cultural exchange.
World's apocalypse online, good cultivating novel where mc travels between cultivation world and earth. Translated up to 700 chapters or so, but recently bought by webnovel and hasn't begun again. Definitely worth a read though.
Not really what I am looking for. Remember, I want something more like Saving 80,000 Gold in an Another World for Retirement or The Empress’s Gigolo where the MC is using this ability to profit or exchange cultures between the worlds. if it was just "visiting diffrent worlds" then a lot of Sci-fi would fit.
My friend what you're looking for is City of Sin. It's not an isekai but it's something just as interesting. In short, the MC's world is connected to multiple sub-dimensions where they conquer and trade in these sub-dimensions to expand their clan's power. Something common to access in a sub-dimension can be very rare in MC's world so we see the MC jumping and expanding his power in multiple dimensions. (Really only a few, we're introduced to more wars and politicking in the middle) The chapter's are around ~1000
https://www.novelupdates.com/series...-become-extraordinary-even-in-the-real-world/ Not exactly what you were looking for, but the flavor might be right. He goes back and forth between worlds, and it has no harem tags. However the amount translated so far has not gotten him far enough into the other world for cultural exchanges (yet).
It's complicated but most of the series he's just with one women. Another World Hopping novels is Records of Unusual Creatures
Carefree Path of Dreams A lot of characters are able to world hop freely, but the MC’s cheat cancels out one of the biggest downsides to world-hopping so I’d guess that counts. As the story progresses, he makes heavy use of his comprehensive understanding of magic and fate gained from visiting dozens of worlds.
Survival records of 3650 days in otherworld. Korean novel, fantasy medieval world. Mc is from modern earth going to another world, at first he live with like elf people in the jungle, learn about their culture and the world, it emphasize the world and it's people so you might be enjoy this kind of novel. it's really good. And he too use it to his own advantage as you described too. World apocalypse online, fighting genre, second chance have ability to travel between worlds, the mc only look at one women btw
I think i might have what your looking for. Its called Fantasy Simulator and its basically someone who gets sent to different worlds to get stronger, but he spends lifetimes in there and accumulates centuries worth of experience. No polgamy and slight romance but its really just focused on the main character and really draws a line between side characters.