[...Ah. Minato thinks he gets it.]

We might have seen this before. But first... What was the date for you, Yoshihisa-san? This place doesn't just bring people from different worlds, but also different times.

[This is either a case of timepoints not matching up - unlikely, based on what Naoto's told him about her experiences - or another situation like Seito. An extremely similar world with key differences.]