According to what I've read, only the first 3 volumes of these series has been licensed while there are 6 volumes released (according to updates). Will this mean that it's okay for a group to scanlate this? I absolutely love these series but I can't manage to find more than volume 2 - volume 3 isn't available in my country and I can't read the japanese raws.

Make a group to scanlate it then.