Molang, Piu Piu, and their friend are on vacation. A turtle carries their friend to an uninhabited island and Molang and Piu Piu rush over to his aid. The strong waves make it difficult for them to return to their resort, but Piu Piu discovers their friend's unusual talent can help them overcome the obstacles.

As Molang and Piu Piu walk down the pier in their wetsuits and with their scuba gear, their friends warn them of a deep sea monster. It turns out to be a mermaid whose singing frightens them at first, but Molang and Piu Piu help him to sing in tune.

Molang and Piu Piu go trick or treating but no one has any candy left. Heading towards a castle, a friend warns them they might find a ghost, but nothing can get in the way of their quest for candy.

Visiting an exhibit on Ancient Egypt, Molang and Piu Piu find inspiration for their Halloween costumes - mummies! However, that evening a storm breaks out, lightning strikes and the famous Momoferty Mummy awakes.

It's decided, for Halloween, Molang will dress up as a wizard and Piu Piu as a pumpkin! When they go trick or treating, Molang bumps into a real wizard, and neither realises their wands have been swapped.

It's snowing in front of Molang and Piu Piu's home, and our two friends decide to build a snowman. A hat on its head, a scarf around its neck, a carrot as a nose and two candied chestnuts for its eyes, and it's done! However, the nearby animals are quick to take all of its decorations. Molang and Piu Piu discover that the animals are hungry and cold, and leave presents for them.

As they go ice-skating, Molang invites Piu Piu to dance. The two friends have so much fun that when they spin, Molang loses his grip on Piu Piu who flies through the air and lands in the forest, knocking him out. Santa's elves, who look just like Piu Piu, find him while Piu Piu struggles to remember who he is.

Christmas is coming. Molang and Piu Piu decide to go into the forest to fetch a great big Christmas tree for their home. They find one that is so heavy that it won't budge, however much they pull or push it. They run into Santa's reindeer and accidentally set them loose, and they help Santa bring them back to his sleigh.