Blood Red Blossoms

From the introduction:

Blood Red Blossoms is set in Japan during the Sengoku Jidai (Age of Warring States), an era of ceaseless conflict between feudal lords throughout the whole country. Despite eventually leading to the unification of Japan, the chaos and suffering caused by this power struggle are twisting and corrupting the supernatural beings inhabiting the land: demons are growing stronger, and even neutral or once-helpful spirits have become fickle and vicious. Unquiet ghosts stalk the bloodsoaked battlefields at night, and demonfires lead travelers astray. Foxes and crow demons haunt the woods.