The Great Master of Gensokyo

Through time travel, Saigyouji Hanyu finds himself transported to the Heian period, a thousand years in the past.
The dog demons of the western lands have just risen to prominence, the tanuki of the four lands are beginning to emerge, the flower demons of Izumo are dominating Tono, and the onmyoji of Heian-kyo are determined to overthrow both the yin and yang worlds…
Her father was a sorcerer who sealed away the Saigyou Ayakashi, her younger sister was Saigyouji Yuyuko, she had a cheap teacher named Kamo no Tadayuki, and her senior brother was the Onmyoji Abe no Seimei.
In order to seal away the Saigyou Ayakashi, Saigyouji Habu, who originally only wanted to live a peaceful life, embarked on the path of becoming an Onmyoji, but his life gradually began to fall apart...
This is the story of an Onmyoji who encounters Gensokyo and a young girl.