Wow, thanks for turning me onto new music! I liked a lot of these. I'm definitely going to have to listen to a lot more Unlucky Morpheus!!! I only knew 3 bands from your top 10, and I'm always glad to have new suggestions.

Some Japanese metal bands I recommend checking out:

-OZ-

Visual Kei/Metalcore band (no longer active, unfortunately).

G∀LMET

Kawaii/kowai Melodic Death Metal band. (I actually haven't been keeping up with new music, and I hadn't realized they released this video until now, so thanks for giving me a reason to look them up again.)

Sigh

Kind of started as a Black Metal band, then branched into more experimental stuff. I'm a big fan of the album Hangman's Hymn.

Gallhammer

Black/Doom/Crust mix. It's not really my favorite thing generally, but I like to listen sometimes.

Zeminence

Symphonic Black Metal. This band hasn't made very much music, but I like what I've heard of it.