The original 2012 version of this soundtrack with extra arrangements that the Vita release trimmed. The end of the world, and happy birthday packages its apocalyptic summer story in gentle acoustic and piano pieces that barely hint at the darker currents underneath.
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"夏の終焉り" appears in three versions here including an orgel (music box) arrangement that strips the main theme down to its most fragile form. "カタルシス" builds to an emotional peak that earns its name, while "beautiful dreamer" floats somewhere between hope and resignation.
The instrumental versions of "Happy Birthday to..." closing out the album like an echo. If you played the original PC release before it hit Vita, this is the version of the soundtrack that lived in your head.