SIGMA are a subgroup of PoleStar that promote in Japan. They also have six members and are known as POLARIS' sister group.

SIGMA

Bokyung

Position: Leader and lead vocalist. 
Birth Name: Kim Bokyung
Date Of Birth: 23/11/1994 (aged 19 at the beginning of the story)
Nationality: Canadian-Korean
Training Since: January 2012 (aged 18)

Akemi

Position: Lead vocalist and maknae. 
Birth Name: Itou Akemi
Date Of Birth: 03/02/1998 (aged 15 at the beginning of the story)
Nationality: Japanese
Training Since: October 2010 (aged 12)

Kiyomi

Position: Main vocalist. 
Birth Name: Takahashi Kiyomi
Date Of Birth: 01/07/1996 (aged 16 at the beginning of the story)
Nationality: Japanese
Training Since: October 2010 (aged 14)

Minjung

Position: Leader and lead vocalist. 
Birth Name: Choi Minjung
Date Of Birth: 03/02/1995 (aged 17 at the beginning of the story)
Nationality: Korean
Training Since: January 2014 (aged 18)

Kin

Position: Lead dancer and eldest of Sigma. 
Birth Name: Zhang Meihui
Date Of Birth: 16/04/1993 (aged 19 at the beginning of the story)
Nationality: Chinese
Training Since: April 2009 (aged 16)

Hyojin

Position: Lead rapper and visual of Sigma. 
Birth Name: Kim Hyojin
Date Of Birth: 21/06/1994 (aged 18 at the beginning of the story)
Nationality: Korean
Training Since: April 2012 (aged 18)

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