- Name: Hirayama Yuki (平山遊季)
- Birthdate: July 25, 2006
- Birthplace: Kanagawa, Japan
- Blood Type: A
- Hobbies: Appreciating various genres of music
- Looks Up To: Oda Sakura, Dambara Ruru
- Hello! Project groups:
- Hello! Pro Kenshuusei (2019–)
Hirayama Yuki was revealed to be one of nine new Hello Pro Kenshuusei members, and one new Hello Pro Kenshuusei Hokkaido member, in an official website announcement on August 2, 2019. They made their first live appearance and were officially introduced at the "Hello! Project Kenshuusei Happyoukai 2019 9gatsu ~Kira~" on September 8th.
- Her favorite types of music are Hello! Project in general, western music, and K-Pop.
- Her favorite sport is ice hockey (especially watching).
- Her motto is "Perseverance is power" (継続は力なり; Keizoku wa chikara nari).