The 2nd Single by the music group Supercell written by ryo, and sung by former Nico Nico Douga singer Gazelle (known offline as Nagi). Illustrator redjuice provided the artwork for the CD jacket.

The PV has a girl named Sayoko (played by actress Ema Sakura) chasing after her imaginary clone in order to retrieve a love letter she had written to her fellow classmate.