Kyo Nukui is a high school student who has not attended class, spending his days shut in his bedroom composing music and posting it online for a handful of listeners. When a polite email praising his newest track asks to meet in a nearby park, he cautiously goes. Waiting there are three elementary school girls, Jun, Nozomi and Sora, who are fans of his music. The three were raised together like sisters, and they turn out to be capable musicians with excellent equipment. They ask Kyo to help them put on a concert at their home, an old church now serving as an orphanage. He is reluctant at first, but after hearing them play he agrees, and his life begins to change. Adapted from a light novel, the series is a slice of life story built around music.