Floriography -勿忘草- (Floriography -Wasurenagusa-)

Background
The song is "the theme" of the flower, myosotis (Forget-me-not) The song was featured in the album EXIT TUNES PRESENTS Supernova 3. It has also been featured in NicoNico Hall of Fame.

Lyrics
Vocaloid Lyrics Wiki

初音ミク Wiki