The Extending Head / Strong Tarou / Kijimuna and the Sea God

A man marries a beautiful, rich wife, but is warned never to wake up in the middle of the night. One night he wakes up. An old couple build a child out of the dirt from their bodies. It comes alive and becomes their son. The Kijimuna fairies that were saved by an old couple fill a beach with flowers but the sea god gets angry. Source: crunchyroll