JUST ONE LIFE

"JUST ONE LIFE" is a song by the Japanese rock band SPYAIR, released on November 13, 2013 by Sony Music Associated Records as the group’s 13th single. It was used as the first opening theme for the 2013 anime television series Samurai Flamenco (サムライフラメンコ), produced by the animation studio Manglobe.

Built as a rock track, the song moves with bright guitars, a firm backbeat, and a chorus that opens into a larger, chant-like hook. SPYAIR’s performance gives it forward-driving momentum, balancing a clean melodic line with a harder band sound throughout.

That mix suits Samurai Flamenco’s story of stubborn everyday heroism, giving the opening a sense of motion and conviction rather than grandeur. Beyond the series, the single reached number 19 on the Oricon Singles Chart, and the song later appeared on SPYAIR’s 2014 studio album MILLION.