Satoshi loses his eyesight completely at the age of 9 despite numerous surgeries, but grows up with cheerful spirit thanks to his mother Reiko’s unconditional love. Surrounded by affection and friendship at high school, Satoshi’s future seems bright until one day his family realizes that he is losing his hearing as well. Determined to never give up, Reiko tries everything she can to give him hope.

The story centers on the melody played by the protagonist (Yoh). When his voice transcends time and space to reach Meguriboshi (another planet far away from Earth), many mysteries that were not told in the original story are revealed.