Board Thread:Manga/@comment-3568954-20150810140746/@comment-4929778-20151230203952

Before the thing of sonny and bean I thought that it was like 1 AD or something. Or like it was now but humanity went back 2000 years and that's where the saying came from. The saying could also mean that it is like a time capsule from distant place explaining how humanity nearly went extinct. And the whole manga is meant to be that time capsule to be read now since 2000 years have officially passed.