I guess you can call them an electropop band but they have this unconventional element to them. They have two vocalists. If I had to compare the female vocals to another artist, it would be chara. They've both got this kind of raspy, sweet voice. The male vocals are smooth and calming but don't really have the same impact. Although I really like how the male and female vocals complement each other.
I would recommend their 2011 album, New! but their 2012 one, Modanica is kind of...meh. They haven't released anything since then.
Song that got me hooked: Fantasty
The other A-side of the single, Cupid, is also excellent.
Official Site: http://www.sonymusic.co.jp/Music/Info/lama/