- Birth Name: Yamaki Risa (山木梨沙)
- Nicknames: Yamakki (やまっき), Risachan (りさちゃん)
- Date of Birth: October 14, 1997
- Place of Birth: Tokyo, Japan
- Blood Type: B
- Height: 157cm
- Specialty: Piano, drawing
- Hobby: Horseback riding, reading manga
- Favorite Color: Pink
- Looks Up To: Michishige Sayumi, Tsugunaga Momoko
- Hello! Project groups:
- [2015.12.xx] Greeting ~Yamaki Risa~ (Greeting ~山木梨沙~)
- [2017.03.25] Yamaki Risa Mini Photobook "Greeting -Photobook-" (山木梨沙ミニ写真集「Greeting-Photobook-」)
- [2018.02.14] sketch me
- [2016.09.24] Country Girls 1st OFFICIAL BOOK (カントリー・ガールズ 1st OFFICIAL BOOK)
- TV Programs
- [2015–] Hello! Station (ハロ！ステ)
- Music Videos
-  Country Girls no Tadaima Radio Kenshuuchuu (カントリー・ガールズの只今ラジオ研修中)
-  Bokutachi Karen na Shounen Gasshoudan (僕たち可憐な少年合唱団)
-  Kurukuru to Shi to Shitto (くるくると死と嫉妬)
-  Kizetsu Suruhodo Aishiteru! (気絶するほど愛してる!)
-  JK Ninja Girl (JKニンジャガール) (guest appearance)
- Her official Country Girls image color is lime.
- Was a finalist in the Morning Musume 12th Generation "Mirai Shoujo" Audition.
- Was in dance club during Middle School.
- Her favorite Hello! Project songs are "Kimagure Princess", "Ame no Furanai Hoshi de wa Aisenai Darou?", "HOW DO YOU LIKE JAPAN? ~Nihon wa Donna Kanji Dekka?~", "Wagamama Ki no Mama Ai no Joke", "Lalala no Pipipi", "Fantasy ga Hajimaru", and "Odore! Morning Curry" by Morning Musume, "CC (Cinderella\Complex)" by High-King, and "Romance no Tochuu" by Juice=Juice.
- Wrote in a magazine that her dream is to become like her many seniors in Hello! Project, able to touch people with her performance.
- Her favorite sport is swimming.
- Revealed on her blog in 2017 that she was majoring in Spanish.