Tengu Otogizoushi

It's the Heian era.

Our heroine Sumire, who has always had a mysterious power, got lost in the forest when she was younger but was saved by an unknown boy. Today, she returns to that forest to practice her dancing.

However, in the forest, she meets a mysterious man with wings on his back - a tengu! A kitsune spirit appears to protect her but, with which side will she side..?