Music to the Ears (Kana Nishino)

I am obsessed with her songs. Well, these two albums at least. There are songs about love and friendship. I know that her voice is a little annoyong at times because she has a high pitched tone but it's fine. The instrumental parts definitely make up for that.

I don't know how famous she is in Japan but she is good. I don't really know many Japanese female singers so feel free to inform me :)