He had only purposed to stay a while on the uplands, and then return to his sister-wife.
His father, the god Ku, had been watching him and had also seen the suicide of the beautiful Kewalu. He saw the spirit pass down to the kingdom of Milu, the home of the ghosts. Then he called Hiku and told him how heedless and thoughtless he had been in his treatment of Kewalu, and how in despair she had taken her life, the spirit going to the Under-world.
Hiku, the child of the forest, was overcome with grief. He was ready to do anything to atone for the suffering he had caused Kewalu, and repair the injury.
Ku told him that only by the most daring effort could he hope to regain his loved bride. He could go to the Under-world, meet the ghosts and bring his sister back, but this could only be done at very great risk to himself, for if the ghosts discovered and captured him they would punish him with severest torments and destroy all hope of returning to the Upper-world.
Hiku was determined to search the land of Milu and find his bride and bring her back to his Kona home by the sea. Ku agreed to aid him with the mighty power which he had as a god, nevertheless it was absolutely necessary that Hiku should descend alone and by his own wit and skill secure the ghost of Kewalu.
Hiku prepared a cocoanut-shell full of oil made from decayed kukui nuts. This was very vile and foul smelling. Then he made a long stout rope of ieie vines.
Ku knew where the door to the Under-world was, through which human beings could go down. This was a hole near the seashore in the valley of Waipio on the eastern coast of the island.
Ku and Hiku went to Waipio, descended the precipitous walls of the valley and found the door to the pit of Milu. Milu was the ruler of the Under-world.
Hiku rubbed his body all over with the rancid kukui oil and then gave the ieie vine into the keeping of his father to hold fast while he made his descent into the world of the spirits of the dead. Slowly Ku let the vine down until at last Hiku stood in the strange land of Milu.
No one noticed his coming and so for a little while he watched the ghosts, studying his best method of finding Kewalu. Some of the ghosts were sleeping; some were gambling and playing the same games they had loved so well while living in the Upper-world; others were feasting and visiting around the poi bowl as they had formerly been accustomed to do.