The omikuji are written strips of paper extracted from a wooden cylinder (the traditional way) or from a vending machine (more modern). If the prediction written on paper is good, the omikuji is kept, but if the prediction is not satisfactory, it can be improved by tying it on special racks, as in the photo. The reason is that this way the bad luck will remain tied there...
EXIF info:
Nikon Df
Lens: VR 28-300mm F/3.5-5.6G
Focal Length: 112mm
Aperture: F/6.3
Shutter Speed: 1/400s
ISO Sensitivity: ISO 1000