I watched this music video on Youtube that used this song and clips from the animated movie "Batman: Gotham Knight" a while ago. The song got stuck in my head but now the video seems to have been deleted and I forgot the name of the song and band! The song was in Japanese, mid-tempo and sounded somewhat sad but very catchy. I think either the song name or the band contained the word "black" but not sure.

Plz help!!