- Birth Name: Aragaki Yui (新垣結衣)
- Nicknames: Gakki (ガッキー), Yuibo (ゆいぼ)
- Date of Birth: June 11, 1988
- Place of Birth: Naha, Okinawa, Japan
- Blood Type: A
- Height: 168cm
- Bust: 80cm
- Waist: 62cm
- Hips: 87cm
- Family: Two older sisters
- Warner Music Japan (2007-2012)
After seeing an audition notice for the junior fashion magazine nicola, Aragaki applied and won the Grand Prix award for the audition. After that, she became a Nicomo (Nicola model) and because of her fashion sense and logical personality gained many fans. In 2004 she put her modeling in Nicola on hold to expand her current career into gravure, appearing on variety shows, and acting. In 2005 she officially graduated from the magazine. The same year, she was in the TBS drama Dragon Zakura. This began her entrance into the acting world and she has gone on to appear in other shows since. Even though she has graduated from nicola, she still appears in the magazine occasionally.
2006 marked the release of her first photobook, Chura Chura, which is regional dialect for something that is beautiful.
- [2008.07.16] Make my day
- [2008.10.15] Akai Ito (赤い糸; Red String of Fate)
- [2009.02.15] piece
- [2009.05.27] Utsushi E (うつし絵; Duplicated Painting)
- [2006.05.17] Xiangyu Shanyui
- [2007.07.19] Nikkori Yui Aragaki in Koi suru Madori
- [2007.12.12] Sora Films (そら Films)
- [2011.04.13] Mahiru no Hoshi (真昼の星)
-  Onna no Ichidaiki ~Koshiji Fubuki~
-  Dragon Zakura
-  Sh15uya
-  Kanojo no Koibumi
-  True Love
-  Gyarusa
-  My★Boss My★Hero
-  Papa to Musume no Nanokakan
-  Code Blue -Doctor Heli Kinkyuu Kyuumei-
-  Code Blue SP
-  Smile
-  Code Blue 2
-  Zenkai Girl
-  Koisuru Madori
-  Waruboro
-  Koizora
-  Furefure Shoujo
-  BALLAD Namonaki Koi no Uta
-  Hanamizuki
- [2006.03.xx] Chura Chura
- [2007.03.20] Masshiro
- [2010.07.xx] Gekkan Yui Aragaki Special
- [2010.06.xx] The Three Little Pigs Sanbiki no Kobuta
- [2010.08.xx] Yui Aragaki x Toma Ikuta Hanamizuki Official Photostory Book
- [2009.11.xx] +act. Vol.24 visual movie magazine January 2010 (Feature)
- [2011.10.22] Calendar 2012
- Best friend is fellow Nicomo Konan Yuka.
- Aragaki was very shy as a child. Even now she is shy around strangers, which is uncommon for most celebrities who get their jobs for being outgoing.
- Her nickname "Gakki" came from fellow actress Enomoto Atsuko.
- Shares not only a nickname with Niigaki Risa, but they were also born in the same year. However, their nicknames are spelled differently.
- Has the same agency of super-popular former U-15 idol Ishida Miku. They even lived in the same dormitory while debuting in Tokyo. She attended the same high school as Satsukawa Aimi.
- Has acrophobia, or fear of heights. During an Up to Boy photoshoot, she had to be in a ferris wheel gondola. Even though her acrophobia was in full swing, she tried her best to suppress it.
- Currently, Aragaki holds the record for most covers of nicola at 15 covers.
- Her pet is yellow Leopard Gecko name Chiichan
- Hobbies: Karaoke, reading manga (especially Lovely Complex), drawing
- Favorite Artist:DA PUMP