Let's see... How would my sisters start this story..?

"A long, long time ago," or something. Before there was any life, there were two forces. One of beginnings and one of endings. The two kami had the combined ability to tell many stories together. But they craved each other's company, and anytime they touched they would end the stories they were writing.

Ah, I think in this case 'stories' means worlds. It's a metaphor! [you're welcome, inaba. he's happy to help.]