At the center of the tale is Nao, a 16-year-old boy, son of a music critic, who enjoys tinkering with machines. During a trip to a scrapyard, he encounters a girl rumored to be a piano virtuoso. Their fates intertwine as she unexpectedly enrolls in his school, intertwining their destinies. Complicating matters, Nao grapples with a peculiar upperclassman and a childhood friend, both urging him to join their musical group.