Pandora no Rakuen / Rakuen no Tobira (パンドラの楽園/楽園の扉) is a single by Aoba Ringo.
The single contains the main theme of the visual novel euphoria: Rakuen no Tobira. It also contains the main ending theme of the euphoria ova: Pandora no Rakuen
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Both songs are sung by Aoba Ringo who also voiced Nemu Manaka.