Fukigen Na Mononokean - Also made into to anime with the same name
Inuyasha - Also made into anime with the same name
Kamisama Hajimemashita - Also made into anime with the same name
Mahou Tsukai No Yome - Also made into anime with the same name
Natsume Yuujinchou - Also made into anime with the same name
Noragami - Also made into anime with the same name
Nurarihyon no Mago - Also made into anime with the same name
Somali To Mori No Kami-sama (Not so much Ayakashi, but different species)
Niehime To Kemono No Ou (Not so much Ayakashi, but different species)
...... Are the ones I can think of :)
I just remembered:
Youkai Apartment No Yuuga Na Nichijou - Also as anime ;)
Okay so I've been really really reaaaaaalllyyy loving ayakashi stories lately so if anyone have any suggestions please give em to me I don't seem to find any good ones on my own (〜￣△￣)〜