Board Thread:Questions and Answers/@comment-39463658-20190514115617/@comment-24407809-20190514151801

Well, there's a bit of an "unreliable narrator" element going on in Keith's retelling of events. I don't recall if the anime changed anything, but when Keith begins retelling the story in the manga he says something to the effect of "it was about, what? 20 years ago, now?" implying that 20 years might not be the exact time frame and Keith is only rounding off the years.