My initial response towards this music anime was quite lukewarm since it was quite different to the music anime(s) I've watched, but I would say the story is built really well especially towards the end. Love that there's an acapella anime since most of them are either a band or idols. After finishing the series, I would say the story is built well. There's challenges/conflicts that build their friendship and push them to improve as a whole. Design wise, I love Karin's design and personality a lot because it's quite rare to see a girl character portrayed as a cool looking character especially in music anime(s)since most of the characters in the market lean towards the cutesy type.

9/10, would recommend.