Since I like to look through useless data, the timeline seems to be as follows.
In the first half of Chapter 2 Nacchan is 25, at the beginning of chapter 1 Kyouko is described as "an older friend of my sister", so unless it's poor wording, she's probably a bit older than Nacchan (not to mention she looks older too). When Kyouko meets Ruri in chapter 1 she notes, that she is "in middle school now", which suggests she wasn't when she was still meeting Nacchan, which puts Ruri's age at the end of chapter 2 as at most 12.
In Chapter 1 Ruri is 14, which means at least 2 years has passed since events in chapter 2, so Nacchan is 27+ and Kyouko probably a bit older than that.
That's about it, I don't think I've missed anything. I guess it is unknown how much time has passed between Tsurumaki's introduction (when Nacchan's 25 is mentioned) and their falloff, so that might add something, but I don't think it would be more than a year.
That is if the story actually has a consistent timeline.
last edited at Mar 31, 2021 11:29AM