Long ago all the elements were mixed together with one germ of life. This germ began to mix things around and around until the heavier part sank and the lighter part rose. A muddy sea that covered the entire earth was created.
One day as they were walking along they looked down on the ocean and wondered what was beneath it. Izanagi thrust his staff into the waters and as he pulled it back up some clumps of mud fell back into the sea. They began to harden and grow until they became the islands of Japan.
The two descended to these islands and began to explore, each going in different directions. They created all kinds of plants. When they met again they decided to marry and have children to inhabit the land.