Again (Fullmetal Alchemist Brotherhood OP1 — original)

Again carries the particular weight of a song that knows it's being asked to open something vast. YUI builds the track from acoustic guitar before electric layers accumulate around her, but the acoustic core never disappears — it keeps the whole thing emotionally anchored in something personal even as the production swells. Her voice here is more controlled and mature than her earlier work, but that maturity reads as cost rather than polish; there's something in the delivery that suggests experience purchased at a price. The melody has a reaching quality, as though each phrase is trying to extend itself just beyond what's comfortable. Lyrically it moves through regret and determination simultaneously, the understanding that looking backward and pushing forward are not opposites. As Fullmetal Alchemist Brotherhood's first opening, it established the tonal contract for the entire series: this story will be beautiful and it will hurt. The production balance between organic and layered is exactly right — nothing feels overproduced, but nothing feels underdressed either. You return to this song in the particular mood where you're processing something that cost you, and finding, tentatively, that you're still moving.