Heavenly Delusion, Volume 5: Tengoku Daimakyo by Masakazu Ishiguro

Kiruko and Maru have found the origins of the mysterious bird symbol, but that information alone only leads to new problems to solve. What's worse is that they may have to travel halfway across the country to further investigate. Along the way, they run into a new form of man-eater and this one poses questions as to whether or not they are willing to eradicate them.