There's this awesome post-hardcore band from my area called LEER who adore that J-Rock sound and work in a lot of that influence into their music (specifically the guitar work).

check out their album SPRINGBREAKNOPARENTS (https://leer.bandcamp.com/album/springbreaknoparents-2)

and the song "Laces/Out" (https://kalisound.bandcamp.com/track/laces-out-live-on-kfjc)

also do you listen to KANA BOON, NANO.RIPE, or PENS+ ? Though from Japan, they're definitely worth checking out if you haven't heard them.
what if all we ever get is each other?