"Midori no Hibi" (緑の日々 Midori no Hibi?) is a Japanese song sung in the background of the TV series Sonic X. This is the second insert song of the broadcast version of the fifty-second episode "A New Start", sung by Off Course during the scene where Chris reminisces about his time with Sonic.
- Lyrics and Composition: Kazumasa Oda
- Arrangement: Off Course
- "Midori no Hibi" translates to "Green Days" in English.
- The song was replaced with "The Last Scene" from Sonic Adventure 2 in the DVD release.