acapella

Neat. I've only heard guys do that, the barbershop quartet or whatever.

>>159488
It is indeed a capella. An a capella OP for an anime about a capella.
>>159489
I grew up with my mother listening to a local a capella group with both male and female members so i've heard both. I 've also heard a lot of a capella covers of songs and music, but this is the first time i've heard it as an official anime OP. Pretty cool.