The short PV for Ayaka and Miura Daichi's collaboration song "Heart Up" has been uploaded onto YouTube. 

"Heart Up" will be released as Ayaka and Miura's single on February 14. It was written and composed by Ayaka and arranged and produced by Kobayashi Takeshi. It's currently being used as the CM song Tokyo Metro's "Find my Tokyo." You can find its full version in the single's DVD. 

Source: natalie