From the Heian Kyo era of yin and yang chaos to the present day when yin and yang are clearly defined, the yin and yang world has gone from prosperity to its present decline.
Once upon a time, ordinary people were often able to see monsters - although most of them would not be happy about it;
Now, the only people who can see "things other than humans" are those with demonic powers. ． ．
[What, the author went to dig a new hole. The new hole is about the story of Onmyoji Abe Seimei QAQ]