Urobe was the son of the great chief of Pyrimi, Africa. One day, he clung to an airplane and arrived in Japan. Due to cold and hunger, he collapsed in the yard of Shishio’s house, where Shishio nursed him. Kurobe was deeply grateful and began to repay the kindness. Kurobe dug a large hole in the yard. Each time he returned the favor, he threw a stone into the hole until it was filled with stones.