GREEN FIELDS was a Hello! Project unit consisting of Shimizu Saki from Berryz Koubou, and soloists Mitsui Aika and Miyazaki Yuka. The group was created in October 2012 alongside Harvest for the SATOYAMA movement.
GREEN FIELDS was formed in October 2012 and they performed their debut single "Boys be ambitious!" at Morning Musume 15th Anniversary Concert Tour Fall 2012 on October 28.
On November 7, GREEN FIELDS' debut single was released, the MV was uploaded to YouTube on November 15.
On November 11, GREEN FIELDS took part in the first SATOYAMA movement fanclub bus tour titled SATOYAMA Higaeri Bus Tour in Hitachiota.
On April 3, GREEN FIELDS released their major debut single "Tokainaka no Kare".
In early June, GREEN FIELDS and Peaberry held their second SATOYAMA fanclub bus tour titled SATOYAMA Taiken Tour Dai 2 dan! Peaberry, GREEN FIELDS to Sugosu 1-paku 2-nichi Bus Tour in Hitachiota. The tour got a fanclub-exclusive DVD release in late October.
In March 2016, GREEN FIELDS's profile was deleted from the SATOYAMA movement official website.
- [2012.11.07] Boys be ambitious! / Forefore ~Forest For Rest~ (Boys be ambitious!/フォレフォレ~Forest For Rest~) - with DIY♡
- [2013.04.03] Tokainaka no Kare (都会田舎の彼)
- [2013.03.02] SATOYAMA movement MUSIC VIDEO CLIPS
- [2013.10.XX] SATOYAMA Taiken Tour Dai 2 dan! Peaberry, GREEN FIELDS to Sugosu 1-paku 2-nichi Bus Tour in Hitachiota (SATOYAMA体験ツアー第２弾！ピーベリー・GREEN FIELDSと過す１泊２日バスツアー in 常陸太田) (FC DVD)
- This is Mitsui Aika's first unit since graduating from Morning Musume.
- All of the members have blood type O.
- Miyazaki Yuka was a new addition to UP-FRONT PROMOTION at the time of the unit. She would later officially join Hello! Project as a founding member and leader of Juice=Juice.
- They were the only SATOYAMA movement unit that did not have a current Morning Musume member while they were active. However, Mitsui Aika was part of Morning Musume before graduating in May 2012.
- GREEN FIELDS is the third SATOYAMA movement unit to release more than one single.