"A cappella" that expresses all music with only voice and body, without musical instruments. A music original project that develops the youth story of high school students fascinated by such a cappella in multiple media. 一That day the boys were fascinated. Standing in front of them are ordinary high school students who are the same as themselves. There are no gorgeous costumes. There is no set of musical instruments. However, the moment they open their mouths, the illusionary harmony overflows and the audiences are enthusiastic. "We also want to sing like that! We want to shine!" A cappella, the kind of singing without music instruments as it's companion, to fascinates their aim, a high school students a cappella competition, Aoppella. Their performance, aiming for the highest place, are about to begin!