A disturbance in the soil.
Footprints – small, but human.
They were wearing sandals. Flat ones.
Was it Nanami? Couldn’t be. First off, he had no memory of making her this kind of sandal, and second, the footprints were fresh – there was no way Nanami could have overtaken him. Distracted as he was by his confounding thoughts, he had traveled in an almost perfectly straight line, but Nanami, on top of being too weak to catch up to a tortoise, was so easily disoriented she was apt to set off for the mountains and wind up in the sea.

Katanagatari Omnibus 1, Page 15