Pieces

"Pieces" is performed by AiRI and appears in Kyoukaisenjou no Horizon, Sunrise's 2011 television adaptation of Horizon in the Middle of Nowhere (境界線上のホライゾン), as its first ending theme. The song belongs to the anime's 2011 run and later appeared on TV Animation "Horizon on the Middle of Nowhere" Original Motion Picture Soundtrack, released on January 25, 2012.

Musically, "Pieces" works as a J-Pop ending with a clean mid-tempo pulse and a chorus that opens the track without turning it overly forceful. AiRI's vocal stays bright and controlled, and the melody moves from restrained verses into a broader refrain that gives the song a reflective, steady close.

That balance suits a series built on reconstructed history, political conflict, and life in a fractured future centered on Japan. As ED 1, "Pieces" provides a calmer landing after the show's dense narrative while keeping a sense of motion, and its later soundtrack inclusion ties it directly to the anime's wider musical presentation.