There have been, and still are, several of us from the same variation on early 21st-century Japan - mostly similar to other Earth timelines, but every now and then some powerful supernatural entity or other takes an interest in human actions, and it falls to a group of teenagers to clean up the resulting mess. Within that subset, though, we've had a frankly ridiculous amount of alternate timelines.
I know of two major incidents in this subset of worlds, one in Iwatodai in 2009 and one in Inaba in 2011 - that's where I'm from. Minako-san and her friend are from Iwatodai, apparently the same one, and there's been at least one other person here from a timeline where Minako-san's role was filled by some really quiet guy with blue hair.
Inaba's where the timeline complications really start to kick in. Myself, Kanji and Chie are all from one timeline. Souji-san, Rise and Naoto are, as far as we know, all from the same timeline as each other - Souji-san led their group's investigation into the incident, Kanji and Chie were part of the team, and I was on the sidelines. Hanamura's timeline started out very similar to Souji-san's, but took a sharp turn afterward.
As for people who are gone, Yua, Seta-san and Adachi-san all led their respective investigation groups. Seta-san was mostly identical to Souji-san but a lot more closed-off, so I suspect the investigation didn't end well for him, but I never got a chance to ask. Yua is the only female team leader from Inaba I've met - I think things went pretty well for her group, but she was really burnt out by Traveling. Adachi-san... was a weird case, since in most other timelines he was the culprit we were all pursuing, but in his he was leading the investigation. There was also another Hanamura for a while. And Dojima-san, who as far as I know overlapped with Souji-san up to the point where he got more actively involved.
We're not entirely sure how the Inaba and Iwatodai timelines intersect. Naoto uncovered repressed information about a time anomaly that brought the two groups together, and that Iwatodai group had the blue-haired guy. Otherwise, we're not sure if their timeline is the same as Ken-kun's - she didn't find that information until long after he was gone - or to what extent Minako-san's might overlap with ours.
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I know of two major incidents in this subset of worlds, one in Iwatodai in 2009 and one in Inaba in 2011 - that's where I'm from. Minako-san and her friend are from Iwatodai, apparently the same one, and there's been at least one other person here from a timeline where Minako-san's role was filled by some really quiet guy with blue hair.
Inaba's where the timeline complications really start to kick in. Myself, Kanji and Chie are all from one timeline. Souji-san, Rise and Naoto are, as far as we know, all from the same timeline as each other - Souji-san led their group's investigation into the incident, Kanji and Chie were part of the team, and I was on the sidelines. Hanamura's timeline started out very similar to Souji-san's, but took a sharp turn afterward.
As for people who are gone, Yua, Seta-san and Adachi-san all led their respective investigation groups. Seta-san was mostly identical to Souji-san but a lot more closed-off, so I suspect the investigation didn't end well for him, but I never got a chance to ask. Yua is the only female team leader from Inaba I've met - I think things went pretty well for her group, but she was really burnt out by Traveling. Adachi-san... was a weird case, since in most other timelines he was the culprit we were all pursuing, but in his he was leading the investigation. There was also another Hanamura for a while. And Dojima-san, who as far as I know overlapped with Souji-san up to the point where he got more actively involved.
We're not entirely sure how the Inaba and Iwatodai timelines intersect. Naoto uncovered repressed information about a time anomaly that brought the two groups together, and that Iwatodai group had the blue-haired guy. Otherwise, we're not sure if their timeline is the same as Ken-kun's - she didn't find that information until long after he was gone - or to what extent Minako-san's might overlap with ours.