Toyotama-hime, better known as Otohime [乙姫], is the Japanese goddess of dragons and the sea. She is the daughter of the sea King Ryujin.
Otohime lived in the sea until a young hunter named Hoori came upon her parts of the water, looking for a fishing hook that belonged to his brother. He usually hunted in the mountains, and his brother Hoderi fished, but they had decided to exchange equipment for a day. Hoori lost his brother’s best fishing hook and went under the sea to find it. Otohime saw him and asked her father to help him in his quest. He found the hook, and also found love with the goddess and they were married.
After a few years in living in the underwater palace, Hoori began to long for the world above. He convinced Otohime to go with him. She was pregnant with his child and consented, so long as he would promise not to watch when she gave birth. He agreed and they returned to the surface. Hoori built a house for them to live in, and it was not long until the time of the birth came. At first, he waited patiently outside, but his curiosity got the better of him, and he peeked inside. It was then that he saw a huge black dragon holding a tiny baby. Otohime, who had changed into her alternate form of the dragon to give birth, was ashamed that her husband had seen her in that form, and so she left him and the newborn child to return to the sea.