Prince Richard and Prince Sablé have been rivals since they were young. When news arrives of a princess in a far-off kingdom who requires rescuing, Richard dashes off in the hopes of saving her before Sablé manages to. Left to catch up, Sablé explores the land, and soon becomes cursed, turning into a frog whenever a strange bell is heard. Sablé must remove the curse and rescue the princess.
Kaeru No Tame Ni Kane Wa Naru also features Sablé's ability to transform into a frog at certain points in the game. This allows him to access areas that he previously could not. The main goal of the game is to conquer a huge castle, however, sections are sealed off until you complete parts of the story, allowing you to explore it in small parts at a time.