In the Universe, there are an infinite number of dimensions, an infinite number of realities where people of different species go about their lives, most utterly oblivious to the fact that such an infinite number of possibilities exist. For those who do know, this knowledge is more often than not considered to be too mind-bendingly overwhelming to think about and they do their best to ignore it, usually over a hot cup of tea.
But this story is not about any such people.
The ones in this story are completely unaware that they have lived many different lives, being reborn again and again, destined to be the best of friends, bosom buddies, two peas in a pod
you get the idea. Their names are Cera and Garadun. These names were given to them when they first came into Existence, and they've been stuck with them in one form or another throughout all their various lives.