Saki Tomogara

Saki is Rentaro's 30th "girlfriend" from the 100 Girlfriends franchise and a repeated third-year student and shadow banchou/delinquent boss at Ohananomitsu High School.

Saki is a third-year repeat student who acts as the "shadow" delinquent boss, even dressing like one. She is the oldest enrolled student since she repeated her third year of school by her own choice she enjoys boasting about her "seniority" over the other people but she also has a high attitude with people who are older than her. She hates being looked down upon since she is notably shorter than Rentarou. Still, she is also a crybaby when she fails to maintain her reputation as the delinquent boss (like not being able to break up a fight between children) and easily feels pain which makes her frail.

Despite her attitude, Saki is so physically frail that when she tries to intervene in a quarrel between two elementary school students who are much younger and smaller than she is, she accidentally ends up being soundly defeated by both of them.