Non Non Biyori is a Japanese manga series written and illustrated by Atto. The series is still ongoing until this day, it has anime adaption in 2013 and 2015. After maybe 7 years later since 2013, i don't understand what does Non Non Biyori mean. I have read all the 10 volumes but still didn't understand what does the title mean or ever explained.
Was it the only author know what the meaning of Non Non Biyori ? Or it's just some random word with no meaning at all ?