Rihito Sajou is an honor student who got perfect scores in every subject on his high school entrance exam. Hikaru Kusakabe plays guitar in his band that performs at live events and is popular among the girls. These boys would have never crossed paths. But one day Hikaru offers to help Rihito prepare for their upcoming chorus festival and the two begin to talk. As the two meet after school, they feel one another's sound, listen to each other's voice, and begin to harmonize as their hearts beat together.