？←HEARTBEAT

？←HEARTBEAT is the second track of μ’s twenty-first single. It is performed by Ayase Eli, Toujou Nozomi and Yazawa Nico. It will be released on July 8, 2015.

The song is written by Hata Aki. The composer and arranger is still unknown.

CD

 * 1) SUNNY DAY SONG
 * 2) ？←HEARTBEAT
 * 3) SUNNY DAY SONG (Off Vocal)
 * 4) ？←HEARTBEAT (Off Vocal)

Videos
PV Video by Lantis =

Audio

 * Does not work on iPad, or any medium that does not support the .ogg audio format.

Lyrics
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