I have recently discovered this band, and I enjoy their sound and their energy quite thoroughly. I believe they can be considered Rock (maybe Metal?), with a bit of a pop inspired flavoring due to the high energy and delivery of the music as a whole. Band-Maid came together in July of 2013. The members include, Miku on guitar and vocals,Saiki on lead vocals, Kanami on guitar, Akane on drums, and Misa on Base.
The major idea behind the band is the Maid aesthetic that permeates the band and the musical themes. I am not as musically inclined to say in exact detail how their sound is and other technical aspects such as that, but I can say that I haven't found many bands recently where I so thoroughly enjoy them. They currently have (as far as I have found) one full album (Maid In Japan) and one Single release (Matador of love and Passion).
With a recent check of CdJapan.co.jp I found out that they will be releasing an Album this November, though I have not been able to currently find a place to purchase their earlier work outside of Japan, and Amazon has a listing for their single, at just under $300.00. If you are interested in learning more about the band here are a few links to give you an idea of what their sound and energy are like, and see if it is what you are into. *Update* After a bit of searching through sites, I have still been unable to find their original Album, or singe (for a reasonable price at least) If you have any info to share on that front, please leave it in the comments, thank you.
Official Website: http://bandmaid.tokyo/ (English version) http://bandmaid.tokyo/?lang=en
Band Twitter Accounts: Band-Maid Official:@ Bandmaid
Facebook Page: https://www.facebook.com/bandmaid
Official YouTube Channel:https://www.youtube.com/channel/UCJToUvYrmkmTCR-bluEaQfA?&ab_channel=BANDMAID