Sora, a girl who once loved singing, became afraid to sing and lost her joy. One day, she and her little brother Daichi discovered a mystical butterfly at a magical pond called Mirror Pond. Drawn to its glow, Sora reached out but fell in, with Daichi following after. They found themselves in a mysterious world where they met a quirky girl named Rococo. Together, they embarked on an adventure through the Land of NOMO, where Sora began to confront the emotions she had buried deep inside.