"Heart Up" (ハートアップ, Hāto Appu) is a song recorded by Japanese singer-songwriter Ayaka and Japanese singer Daichi Miura. It was released as a single by A Station on Valentine's Day, February 14, 2018. The song was written by Ayaka and produced by Takeshi Kobayashi. "Heart Up" was used in television ads for Tokyo Metro's Find My Tokyo campaign, starring actress Satomi Ishihara. The song also served as the theme song for the February 2018 broadcasts of the AX morning show Sukkiri. The CD single was released in standard CD-only and CD/DVD versions.