A titan named Trencoss kidnapped a girl, Princess Eileen and planned to force their marriage. 100 guard dogs and the strong Trencoss keep her from escaping. Sensing her sorrow, a little white cat gave her instructions (involving the red, blue and yellow balls) and sent for someone to rescue her.
Each ball transforms into a sailboat, signifying him having 3 chances. They are set to a route heading towards a place where the prince will find weapons to defeat Trencoss. However, on his journey, the prince is not allowed to eat which he does when he comes to a mass amount of fruits.
When he eats, he will forget all about his goal to save princess Eileen. Upon eating the fruit, he loses his memory and falls in love with an illusion, becoming engaged to it. In reality, the girl and her parents turn out to be snakes and with the help of the white cat, the Prince manages to escape and remember the Princess.
With the second ball, he sets off once more, filled with determination in his quest. This time, he comes across berries that fall into his boat and he can no longer resist the temptation. He obviously eats again, forgetting Princess Eileen.
As soon as he Prince of the Silver River ate, he was kidnapped by giants, being prepared to be eaten. When the women giant asked if he wanted anything as a final wish, the little white cat arrived and gave him instructions to help him leave as well as helped restore his memory of his adventure once more.
Using the last ball, our hero finally makes it to his destination, where he retrieved the necessary weapons (100 cakes and a sword) to defeat Trencoss and his dogs. Victorious, him and Princess Eileen marry and live happily ever after.