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"Proof/No Vain" is Mell's second single under Geneon Entertainment. "Proof" was used as the first ending theme for the anime series Hayate no Gotoku!. The single reached number 18 in the Oricon charts and sold a total of 13,000 copies. From Wikipedia (https://en.wikipedia.org/wiki/Proof/N...) under Creative Commons Attribution CC-BY-SA 3.0 (https://creativecommons.org/licenses/...)