Board Thread:Questions and Answers/@comment-188.166.87.191-20160722121104/@comment-2063612-20160722173306

You're taking it far too literally. When Nasu calls something a "slightly shifted world parallel world", it's his way of saying "don't think about the inconsistencies too hard." Saying it's a prequel is correct and saying it's slightly different is correct. One doesn't make the other wrong.