The Japanese creation myth is referred to as "Kojiki" or "The Records of Ancient Matters." The Kojiki was written in the 8th century, and is one of Japan's oldest existing texts. It includes stories of the creation of the world, the activities of the gods, and the origin of the Japanese people.
The Kojiki begins by explaining the origin of the universe. There was an initial void, known as "ye no Uzu," which held "divine spirits." Three gods, Izanagi, Izanami, and Amenominakanushi, created the world by standing on a bridge as divine forces.
The Kojiki then goes on to explain the creation of Japan. After many attempts, Izanagi and Izanami were successful in their holing of an island from the sea, which became the first land. The gods gave the river names and divined a series of gods who would rule the land. The sun goddess, Amaterasu, is given special status as the symbol of the imperial family.
The Kojiki also tells of the birth of several other gods and goddesses associated with natural forces and Buddhism. These include the God of Thunder, the God of Wind, the Goddess of Darkness, and many more. The story culminates with the ascension of the first emperor, Jimmu.
Although the primary focus of the Kojiki is the creation story, it also includes notes on the geography, government, literature, and culture of early Japan. This makes it an important text for scholars of Japan’s history and culture.
For those who are interested in reading more about the Kojiki, University of Virginia Professor William P. Woodard has written an excellent summary of the text which is available here: https://www.uni.edu/woodall/class/asiance1/kojiki1.html.
In short, the Japanese creation myth is referred to as the Kojiki or “The Records of Ancient Matters.” It is one of the earliest texts in Japan and explains the creation of the world, the activities of the gods, and the origin of the Japanese people.