According to legend; at that time, the Imperial Palace was taken over by an evil demon, which caused the Emperor to fall ill with great anxiety and suffering.
Since then, hama yumi have been used in Buddhist and Shinto rituals of purification (i.e., Shihōbarai, 四方払い, the Purification/Sweep of the Four Directions).
In Japan, it is believed that merely the twanging of its bowstring will frighten away ghosts, evil spirits and negative influences from the house.
Hama-yumi replicas are scale versions of the sacred Japanese bow, coated with urushi, wrapped in fine rattan and accented in gold leaf.
They are displayed in a stand, along with two arrows tipped with yanone (traditional warrior tips); one representing male and the other female, yin and yang (vermilion signifying male energy (yang), and black representing female energy (yin)).