The well can also transport information, both digital and DNA. How much is a live dodo worth?
As for magic, including martial arts, and technology:
Technology can typically support a much larger population than magic, because it's amenable to techniques like mass production. (When magic does allow such things, it tends to end up looking a lot like technology.)
A larger population means that the world's best mages/martial artists will be better, in potental, simply because there are more candidates to choose from. Technology can also support a much larger percentage of arcane specialists, since it means we don't need 90% of the population to be peasants. (And, again, when magic is so cheap and common we don't need peasants, it tends to be functionally equivalent to technology.)
Thus, the modern world might even start out with an advantage in the arcane arts over the Sengoku Jidai. In the long one, it would certainly have one - clear proof of real magic would lead to a flood of researchers, and money, investigating the field, provided only that strengthening magic didn't bring about the collapse of technology.
If it did, people would die by the billion, which makes for a grim story. If not, the modern world heads for technomagic, combining the best of both approaches, and in a century or so would be able to trample the Sengoku Jidai underfoot - but a century is ample time for dozens of stories.
For the first few years, the modern world would be too busy taming the monster-haunted wilderness replacing Nerima to help the displaced version much, but there's also another possibility that would reduce the possibility of help even further.
What with the colliding temporal distortions, and the aura of chaos, the history of the oriignal timeline easily could be rewritten. Nerima could find itself connected to a modern world where none of the love polygons ever happened, and where the history of the last few centuries is utterly different to what they know - Japan a province of the Korean empire, China split into five warring states (2 democratic, 2 fascist, 1 theocratic), America dominated by the Iroquois republic, etc
In such a situation, getting help through the well wouldn't be much of an option.
As for magic, including martial arts, and technology:
Technology can typically support a much larger population than magic, because it's amenable to techniques like mass production. (When magic does allow such things, it tends to end up looking a lot like technology.)
A larger population means that the world's best mages/martial artists will be better, in potental, simply because there are more candidates to choose from. Technology can also support a much larger percentage of arcane specialists, since it means we don't need 90% of the population to be peasants. (And, again, when magic is so cheap and common we don't need peasants, it tends to be functionally equivalent to technology.)
Thus, the modern world might even start out with an advantage in the arcane arts over the Sengoku Jidai. In the long one, it would certainly have one - clear proof of real magic would lead to a flood of researchers, and money, investigating the field, provided only that strengthening magic didn't bring about the collapse of technology.
If it did, people would die by the billion, which makes for a grim story. If not, the modern world heads for technomagic, combining the best of both approaches, and in a century or so would be able to trample the Sengoku Jidai underfoot - but a century is ample time for dozens of stories.
For the first few years, the modern world would be too busy taming the monster-haunted wilderness replacing Nerima to help the displaced version much, but there's also another possibility that would reduce the possibility of help even further.
What with the colliding temporal distortions, and the aura of chaos, the history of the oriignal timeline easily could be rewritten. Nerima could find itself connected to a modern world where none of the love polygons ever happened, and where the history of the last few centuries is utterly different to what they know - Japan a province of the Korean empire, China split into five warring states (2 democratic, 2 fascist, 1 theocratic), America dominated by the Iroquois republic, etc
In such a situation, getting help through the well wouldn't be much of an option.