/For context and details about the machine/
-Gengai's Workshop-11:50 AM
"Gengai-saaaaan~ How many watches did you make?", Aimi stretched her arms. "Listen, miss Aimi, you've been here for almost 2 hours, can't you at least give me some support here?", Aimi just looked at the machine, grinning, "Ahhh, I just can't wait. Remember the last time you accidentally got zapped and went back in time for 5 seconds?", "that's because you interfered with the test runs on the rats.", Aimi grinned and looked at Gengai, " Gengai-san, don't pretend that you don't care at all, the first time I introduced you to these foreign materials, you got excited.", Gengai just laughed, "it can't be helped. These things you found were legitimate. Although, even when I'm this confident about all of my works, this... Universal Dimension traveling stuff is just too extreme", "Right? You can't even believe it, huh? That's what makes this trip exciting" Aimi exclaimed, "well, whatever happens, y'all should be careful" Gengai told her. "You just have to capture these bad guys, right?", "yep".
Meanwhile...
Gintoki and Hijikata met a few blocks away from Gengai's workshop. They were both headed towards the workshop. "Aren't you supposed to be working on your duties or something?" Gintoki ridiculed, "it's none of your business, I'm just here to find out if it's real".
...
They both stood in front of the workshop and knocked. As soon as Aimi heard, Aimi enthusiastically opened the door for them and smiled, "I guess I got a lot of explaining to do".^Aimi's Natration^
Chuz! See this machine? It doesn't have a name yet, but this is our key for this mission. This machine will be the source for these watches. Each watch has the same materials in it, and Gengai has already made 12 from all of the materials we found. These watches are going to be our teleporter, but since we have less energy source, there have to be 3 or more people who will teleport to its choice of time or dimension, although if we zapped out of here, we will be teleported somewhere in edo, so we don't know where exactly where we're going to be zapped at.
I told you that my abilities were involved here. The brother's DNA will guide our GPS. When I read their memories, only two of the three brothers will travel first in a few days, we just have to be there first, so if you can see the three dots beside the watch, those are the mosun brothers. If one of them lit up green, that means they are in one of these 5 places our GPS points out, yes, 5 places. 3 places from our pasts, and 2 from other dimensions. If you look at this active watch on my hand, all of the three dots are off, but if one of the brothers gets in one of these 5 places, it will let us know what time or dimension they are in.
Now the time limit... This machine has a span of 20 days before it doesn't work again, and this machine has the same span as the brother's machine. How do we get back here? Someone will have to be In charge of the machine and stay here. This machine will bring us back with just a button, but of course, we have a selection...
So any questions?
^End of Narration^Gintoki and Hijikata were trying to process everything Aimi said.
Gintoki raised his hand, "um, are you sure about those 5 places?", Aimi looked at him, "chuz! Those are the only places they can go through, this machine is just the same replica of theirs, but with less energy." She explained. Gengai stood up and walks towards them, "the machine will be ready soon, so all of you should prepare".
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Voyage of Unfamiliar: Gintama Fanfiction
Fanfiction3 years later after Gintoki and the others defeated Utsuro, everything changed. The Shinsengumi came back after having a fierce training from another planet. After meeting this prurient woman from yoshiwara, Aimi, the Yorozuya and the others are in...