I recently listened to the Japanese band Dazzle Vision and was blown away. Maiko, the singer/screamer has an amazing voice like none I've ever heard of in a Japanese band. Her songs can easily go from melodic and pretty to raw and edgy. If I were to compare them to a western band it would probably be Flyleaf, although I like Maiko's screaming better. It sounds so much more powerful.
The lovely Maiko
I was also surprised by how low-key they still are. Its amazing to me how they are still relatively unknown. So yeah, check them out if you're a fan of metal, visual kei, female singers, screamo, or Flyleaf.