The theme was made into several versions, but the outline is about a great flood which was destroyed all the humans all over the world except a pair of brother and sister, or aunt and nephew.
Meskipun ada banyak versi, secara garis besar tema ini menceritakan mengenai banjir besar yang memusnahkan seluruh manusia kecuali sepasang kakak-beradik, atau bibi dan keponakan.