SAYAKA is a member of the Japanese pop vocal and dance unit Happiness and collective group E-girls. She attended the dance school EXPG in Miyazaki, appearing at EXILE's events, in music videos and on tour as a background dancer. In the spring of 2009, it was decided that she would become a member of the LDH unit Happiness among other EXPG students, and her official stage name became SAYAKA.
- Stage Name: SAYAKA
- Real Name: Nagatomo Sayaka (長友さやか)
- Birthdate:September 20, 1995
- Birthplace: Miyazaki Prefecture, Japan
- Blood Type: B
- Height: 152 cm
- Hobbies: Remaking things, Japanese style stream egg
- Talent: Dancing
- Favorite Food: Homemade Kakuni, savory egg custard
- Favorite Brand: Kitson
- Goal: To be able to succeed in various fields
- Bands / Groups:
E-girls Song Participation
- Main video
- Seifuku Dance
- Fellow Happiness members regard her as the dance leader.
- She has been friends with YURINO for a very long time and both attended EXPG an Miyazaki.
- EXILE's members, MATSU and AKIRA praised her for being a great dancer who 'sparkles'.