According to the section on the tenson-korin (the descent to earth of the Sun-Goddess's grandson), Konohanasakuyabime became pregnant after spending only one night with Ninigi, who thought the father of the babies was a kunitsukami (Earthly God), and Hosuseri no Mikoto was a second child out of the three gods, who were born in a fire to eliminate Ninigi's suspicion.
天孫降臨の段において、一夜で身蘢ったためにニニギに国津神の子ではないかと疑われ、コノハナノサクヤビメがその疑いを晴らすために火中で生んだ三神の第二子である。