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This is gonna be a bit long cause a lot of this is me mumbling about all my thoughts on this so far. Also this is kind've half a repost and have a continuation to this post I made a while back. This time I got the mods approval, so I pray it won't get taken down. Also Also this post will contain spoilers for Re:Zero, but it will only contain world building details. If I ever end up spoiling plot details, those will be put in spoiler tags.
Mushoku Tensei and Re:Zero have always been my two favourite isekai stories of all time. This goes beyond the anime and to the Light Novels as well. Though I'm not caught up on both, I'm up to date with Mushoku Tensei's anime, but only at volume 10 in the Light Novels. As for Re:Zero I finished Arc 6, but Arcs 7 and 8 are over 10 volumes now so I'm really behind on that as well. Even so! I love those two stories to death. For Mushoku Tensei though, I plan on reading the entire thing from the start this october and binging it all the way through. If this post feels more Re:Zero focused than Mushoku, apologies for that- Since I've read over double the amount of Re:Zero content than Mushoku, I just know more about that than this. I guess in a way I'm relying a bit more on you guys to fill in the Mushoku gaps lmao.
Anyway! This all started when I first viewed the maps of both Mushoku Tensei and Re:Zero's world.
So Mushoku Tensei looks like this- (I think this is an official map?)
And Re:Zero's world looks like this. Also credit to the artist u/worel. I picked the fan map instead of the official one cause the official one kinda looks a bit child-y imo
So then I wondered, right- what if at one point in Mushoku Tensei, and this came from out of nowhere. Something which no one in Re:Zero or Mushoku Tensei (including Hitogami or Orsted) could've seen coming, bam! the Re:Zero world is smacked right in that open ocean.
https://preview.redd.it/vz8m5ufm4qzc1.png?width=995&format=png&auto=webp&s=9b62004027b3484bb782bfc30c816e64f557376f
From research, its seems like Re:Zero's world is described as being as big as Eurasia and that makes a lot of sense given in the context of Re:Zero's lore, half the world was destroyed by the Witch of Envy. My friend is really adamant that Mushoku Tensei's world is only 1/6 the size of earth because it's only one side of the 6 worlds, but idk- I like to think that map on its own is as big as our global map. In any case, I found that giant ocean a perfect place to drop the World of Re:Zero in.
I find this idea fascinating because both worlds are very expansive with lots of culture and lore and politics at play that feel like they all have domino effects. Also at this point in Re:Zero, the story is going through a history defining political struggle. With the giant cast of characters, if this kind of crossover were to happen (in a way that isn't like Isekai Quartet), there will be so many moving parts between so many different characters that the possibilities are almost endless!
This is kinda where I'm at a loss. While I know how to start the fanfic, I don't know when and "where-to-where" it should happen.
Initially, I thought it'd be interesting to summon Subaru to Lugunica right as turning point 1 happens as there would've been mass teleportation and it works as a nice set up. But at this point Rudeus would've been sent to the Demon continent at age 12. Subaru and Rudeus would have a roughly 5 year age gap. I know this is a really dumb thing to get hung over by, but I would like for them to be roughly the same age at most 2 years age gap because I do want for them to meet in some capacity eventually and having them be roughly the same age would be nice. Also if I do the setting of turning point 1, by the time Rudeus crosses the Demon continent which took about six months, in the original Re:Zero timeline, Subaru would've already gone through Arc 1, 2, 3 and 4 with months of extra time to spare. So one would be rather uneventful while other would've already progressed so much in narrative if we look at what happened in their respective original timeline. Another thing is by the time turning point 1 happens, Rudeus doesn't really have a large group of people around him. It takes him months if not years to form that group that we saw in Season 2.
I also thought about having Rudeus be teleported to Lugunica around the same time Subaru, so that instantly puts Subaru and Rudeus together. Ultimately Rudeus' goal would still be to return to the Ashura kingdom so that makes for an interesting concept on its own seeing how Rudeus and Eris would navigate Lugunica. But that would mean not meeting Rudjerd and, while I don't know how not meeting him would affect the story, it'd be such a waste for him to just disappear.
So I was thinking about picking a time that's most eventful in Rudeus' life where there wouldn't be much time skips. My friend told me that Mushoku Tensei does stop jumping around time too much after turning point 3 (I have no idea what happens in turning point 3, but I'm so excited. Saw the opening and it seems Rudeus, Paul and Roxy and co. are all working together to save Zenith from the dungeon, Hype!). Though at that point, it'd be a bit unfair to Subaru who at the start of the story knows no one. If word got out that Re:Zero's world was summoned into another world in arc 1 especially, Subaru would be far more suspicious and I'm pretty sure would be suspected to come from the sixfacedworld. Though luckily, after the events of Arc 6, Subaru gets teleported by that point in Re:Zero, Subaru would have many friends and would be far more acquainted with Re:Zero's world much like Rudeus would be to his by the time he's roughly around Subaru's age.
Right! Next is the "Where-to-Where." This isn't really an issue, must more just I haven't decided yet. So Re:Zero's world is split into 4 main empires, the Sacred Vollachia Empire, The Holy Kingdom of Gusteko, the city-states Kararagi, and Dragon Kingdom of Lugunica. Depending on what Orientation Re:Zero's world is, it'll influence the story in so many different ways. Like if Lugunica now faces south, then the miasma from the sand dunes would fuck up a large chunk of the Milis kingdom and in this case Vollachia would face west, that'd put them head to head with the Shiron kingdom. Though since I haven't read Arc 7, I don't know how things will actually play out. But here I'll most likely just stick to having Re:Zero maintain its north east south and west directions.
Though I always thought if Re:Zero was summoned to Mushoku Tensei's world during the start of Arc 1 and Lugunica faces west as it should, and Emilia asked Subaru where he came from and Subaru just stupidly pointed to the east then it's later revealed that the east is the demon continent, things would be hella awkward later on and funny. Though one thing I don't know is if Mushoku Tensei's demons are reffered to as "Akuma" cause that's a bit different from Re:Zero's Oni.
But- yeah, that's pretty much it. I wanted to ask you guys for your thoughts on when you think the best time to summon Re:Zero to Mushoku Tensei's world is. If there's any point after turning point 1. Another thing is I'm very interested in the political and cultural implications of this. Afterall, Summoning a whole different world would make both sides curious about the other. What's more, Nanahoshi and Rudeus being native from Japan would be able to tell instantly that Re:Zero characters all throughout the world speak Japanese making things so that communications between the two worlds would be very difficult. Rudeus would be a very reliable asset to the Sixfacedworld kingdoms, though I'm not sure if he'd want to immediately reveal he can speak japanese. Same goes with Nanahoshi I suppose.
And depending on the time period, tensions between the two worlds could be extremely high. Adding onto how they can't really easily communicate, Vollachia and Gusteko have reputations for being very agressive, and Lugunica is in the middle of a political debacle. Wars could break out if things don't stop escalating.
And to the side of Subaru and Rudeus, their adventures would drastically change. Especially Rudeus who travels a lot. It's possible that there are some people he'd never end up meeting cause something, even just one thing, changed. My friend also accidentally told me that Hitogami has the ability to make himself seem super trustworthy towards all those in the six faced world, so his ability won't work on people from Re:Zero's world. Orsted too would recognise this as being an anomaly (obviously). Alongside this, the existence of authorities and the completely different magic system would have the two worlds collide and there would be lots of interesting match ups as time progresses. Both worlds having absolute monsters who may or may not collide.
Interestingly enough, I think while the six-faced-world will be surrounding Od Lagna, judging by the type of characters present in Re:Zero's world, it seems they will most likely be the instigator for any big event. Though I think it'll be very weird if they'll instantly realize that a new world was summoned. News don't really travel fast in fantasy worlds
We can also say that the royal selection in Re:Zero's world could either be put on hold as they have to prioritise this bigger world scale event, or maybe they'll have the King candidates work together. So many possibilities!
If you read all that, thanks in advance!!