The Chocolix family have just moved from the Kingdom of Chocolovely to the Kingdom of Chocoland. The parents are happy with the change, but their children, Chocomark and Chocolyne, are unsure.

Chocomark and Chocolyne go to the aquarium on a school trip. Chocolyne hides Sweetcookie, the family's pet dog, in her backpack. There, they meet little Max, who is sad and feels rejected for being little.

Chocomark is having nightmares and is afraid to go to sleep. But, when he finally falls asleep, he has an incredible dream with a monster that takes him to the Monster Kingdom.

Chocomark and Chocolyne receive a call from their grandmother Tita, inviting them to an exhibition at their old school in the Kingdom of Chocolovely.

Caramel, Chocomark and Chocolyne's classmate, tells them that she went to see the Blue Chocolate Lake, a place filled with the purest edible blue chocolate. The siblings are eager to visit the lake, but their parents do not think they should go.

Don Cacao decides to throw a party for all the friends of the Kingdom of Chocoland in return for the warm welcome his family received. Mrs White decides to serve chocolove to all the guests, made with a recipe that is a family secret.