Behind Master

There's an old legend that a monk and a tengu (heaven dog - 天狗) are rivals. Kiyomi is a monk who was saved by a girl named Sasuka. While staying there, he found out that there were girls who went missing. Villagers think the culprit is a tengu. Is the tengu really the culprit? And somehow it seems that Sasuka relates with the tengu, and that Kiyomi isn't really a monk?