Having defeated The Snow Demon and getting Tick Tock, its creator out of the way once again, Yano and Sizzle cross a bridge to find the black cloud in the sky. With the help of his pompom, Yano and Sizzle are teleporting again to find the black cloud which was flying into the Surfy Sea. They will be able to breathe under the sea with the help of magical diving masks. They arrive in the sea and admire the wonders of the underwater world. They meet an oyster called Olivia, who has already heard of Yano and his mission about the dewdrops, but she warns them that the black cloud is heading towards the great trench. Despite Olivia‛s warning, Yano and Sizzle swim along and very soon their road is blocked by a very mysterious sand dune. Maybe this is not a sand dune after all? What is this thing be disguising itself as a sand dune? The black cloud? Or something even more mysterious?