In April, Yagi became a first generation member of the local Osaka idol group Tsubomi after passing an audition, thus joining the Yoshimoto Creative Agency.
On December 27, Yagi also became a first generation member of the KRD8, a local idol group in Himeji, while still a member of Tsubomi. During her time in KRD8, she was appointed the sub-leader of the group.
On March 30, Yagi graduated from Tsubomi and left the Yoshimoto Creative Agency.
- Name: Yagi Saki (八木沙季)
- Nicknames: Sakipyon (さきぴょん), Shaki (しゃき), Yagisaki (やぎさき), Pyon (ぴょん)
- Birthday: May 31, 1993
- Birthplace: Himeji, Hyogo, Japan
- Blood Type: A
- Height: 164 cm (5 ft 4.5 in)?
- Western Zodiac: Gemini
- Eastern Zodiac: Rooster
- Lovelys Member Color:  Light Blue
- Tsubomi (2010-2014)
- KRD8 (2013-2016)
- Lovelys (2014-)
-  Harukanaru Toki no Naka de 6 Gaiden ~Tasogare no Kamen~ (daily guest role)
- The Lovelys group mascot is a plush animal described as "the child of an axolotl and a rabbit" named Upagi (うぱぎ) that belongs to Yagi Saki. Upagi also has its own Twitter and Instagram.
- She shares the same last name as Tsubaki Factory member Yagi Shiori.
- Official Blog
- Upagi Twitter
- YagiTube Official YouTube Channel
- Wikipedia: Japanese