Who wouldn't want a dragon at home? Not just anyone has such a pet. Except Tomas, of course. His little dragon is not only a wonderful pet, but above all the best friend in the world. However, Tomas is suddenly sadder and sadder day by day. Because he promised his grandfather that he and his friends who grow dragons with him will set their little friends free so they can go back to where they belong. It's just that it's easy to promise and much harder to deliver. They are having so much fun together! And in addition, Tomas is on the trail of revealing the true origin of the mysterious dragon plant - a plant from whose fruit dragons hatch.