幼なじみにさよなら (Osananajimi ni Sayonara)

Background
The song was uploaded to Nico Nico Douga on August 8th, 2012 and has gained over 200 views, yet it was succeeded by its YouTube counterpart (uploaded by EmpathP), which has gained over 7,000 views.

The song is based on, like the title suggests, saying goodbye to a childhood friend. EmpathP says she wrote the song after finding an old notebook she had in kindergarten, in which there were drawings of her old imaginary friend. She realised how much fun she had had with him, and wondered why she ever stopped believing in him. Thus, she wrote the song.

In EmpathP's upcoming album Fables of Farewell, "Goodbye to a Childhood Friend" will be a vocal and an instrumental of the song will be included along with it.