A long time ago, in a remote kingdom called Dole, a terrible disaster happened to the king, and a heart attack took the king's life. The dead king left all his sorrows to the beautiful Princess Pea and his subjects. In this country that has lost its king, there is dejection and despair everywhere. Even the sun disappeared from the sky, the flowers faded and the colors were no longer bright, and the laughter gradually disappeared on this land that was once full of magical colors.
In such a dark and lifeless kingdom, a little mouse named De Pero was born, and De Pero, who aspired to be a hero, was finally expelled by Dr. Lester for violating domestic strict laws. On the vast land outside the Kingdom of Dole, DePero met Roscoro the mouse who was also expelled from his own country.
Soon after, the exiled Depero learned that the Princess and the Pea had been locked up in the dungeon, and Depero, who was in love with the princess, decided to fight to the death and rescue the princess; the filthy low rodent was summoned by its boss and planned to start by lowering the gutter. To challenge Human Fa
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