Before you read this manga, I recommend you read the K-ON! manga or watch the anime series beforehand. It follows from where the manga [and anime] left off from the former junior Azusa Nakano's point of view as the new Light/Pop Music Club president along side her friends Ui and Jun. It is very similar to Vol 1 except there is a comparison between the new club and the former club members (read Vol 1-4 or watch Season 1 and 2 and movie for reference). Gaining new members or the club isn't official, learning new instruments and even more tea to be had in between. Nomatter what form you're reading in, (PC/ebook or manga) this is a really good read following from the rollercoaster of the source material by the author Kakifly and the Studio Kyoto Animation respectively.