- Birth Name: Yahagi Yukina (矢作有紀奈)
- Nickname: Kina (きな)
- Date of Birth: March 13, 1995
- Place of Birth: Saitama, Japan
- Blood Type: B
- Height: 156cm
- Bands / Groups:
SKE48 Song Participation
|Igai ni Mango||Igai ni Mango|
|Yume no Kaidan wo Nobore!||Kenkyuusei|
|Muishiki no Iro||Yoake no Coyote||Sagami Chain Senbatsu|
|Sawaranu Romance||Sakura Love Letter 32|
|Ikinari Punch Line||Dareka no Mimi||Team KII|
|Otona no Sekai||B Laviere|
|Kakumei no Oka||Chime wa LOVE SONG||Kenkyuusei|
- Originally an eighth generation member of SKE48 Kenkyuusei, she was promoted to Team KII on October 5, 2017.
- She announced her graduation on October 6, 2018, and graduation on November 10th.
- Her younger sister is Yahagi Moeka, a third generation draftee in AKB48.