Usotsuki to Inugamitsuki

Tsukumo’s father had always told him not to be near the forest when dusk approaches. However, he was curious and often tread near the forest even though he cannot walk well due to an accident. One day, he sees something red along the road… is this blood? Then he could smell the scent of a beast, even though he could not before. Was this the reason why he was told to stay away?