Sakura Oshigiri

A part of The Underground Comrade and is Zakuro's younger sister.

Sakura is shown to be quiet, kind and caring and very considerate of other people, but is usually scolded because she wanders off on her own a lot to get stuff for other people. She is also shown to be very guilty of hurting Zakuro once in the past and doesn't want to be a burden to her brother any more. Thus, she asks Kaikoku to not tell her brother she was in the Underground.

She was also once a gamer and then was put in the game as part of the 11th avenue, but then got penalized and sent to the White Room. There, she was united with Chihiro who tried to get himself penalized as well to keep each other company and find a way out of there. After finding the secret passage, they meet Nanami and the three stayed underground for the rest of the following years until Kaikoku found the tunnel and was brought to their underground shelter, finding out her brother was in this game as well.

(Source: Naka no Hito Genome Wiki)