I recently discovered that there's a thriving metal scene in Japan, consisting of a wide variety of sub-genres.
In the pop-metal with female vocals sub-genre, there are the following bands:
Unlucky Morpheus
Aldious
Lovebites
Sonic Lover Reckless
Mary's Blood
BRIDEAR
Raglaia
Cross Vein
LAST MAY JAGUAR
Cyntia
WagakkiBand
Band Maid
BabyMetal
DOLL$BOXX
More extreme metal bands include:
Flagitious Idiosyncrasy of the Dilapidation
DIR EN GREY
Gallhammer
Viscera Infest
Other stuff:
Tricot