The Ravens of Thri Sahashri (Vision Arc. Vol. 1)

"There was a presence, like wings!"

After a year of unexplainable visions, Feth feels no way of escape. When his father gets called on a business trip to Japan, Feth comes with. It was the night of a business party at the Ambassador's Hall, he meets her for the first time. A pretty girl named Ren.
Things seem to be falling into place for Feth. But when Ren kissed him on the cheek, a vision reveals to Feth, a very dark secret. Feth, then decides to throw himself into harms way to help Ren.
Not only does Feth know Ren is a courtesan, he also learns that there's something far out of the ordinary underneath that vision. A presence, like wings. Feth must solve the mystery behind everything, including the reasons for his visions before his time runs out.

"They feast on corrupted souls, which makes her their next target!"