Two years ago, the world was in a war as a mysterious alien who calls itself "Yamiuchu" wanted to conquer the planet. However, it was defeated by the three legendary heroes. With their brave efforts, they sealed him away in the deep recesses of the planet, thus bringing the world in a state of peace. Two years later, Anita gets involved in a plot to save the planet when her friend's plants mutate into monster. She along with others have to find and destroy Yamiuchu remains once and for all.