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An ending theme from the Fullmetal Alchemist: Brotherhood anime series.
I haven't watched this recently, but it's in one of my playlists that I've been listening to because of the release of season 3 of The Seven Deadly Sins.
The song is in Japanese, so I have no idea what the guy's singing about.
I really like this song though, it's one of my favorite anime soundtracks.
So enjoy, and do yourself a favor and go watch Fullmetal Alchemist: Brotherhood