Shiraitodai High School (白糸台高校) is a girls private school located in the West Tokyo area and the primary rival of Kiyosumi High School in the Saki manga and its anime adaptation. It is also a secondary rival of Achiga Girls' Academy in the spin-off manga Saki Achiga-hen episode of side-A and its anime adaptation.
Teru Miyanaga led her team to become not only the prefectural representative, but also the national champion at the 69th Inter High School Mahjong Championships. Shiraitodai also defended its title at the 70th Inter High. If it is once again successful in its third year, Teru will become the first person to become a national champion all three years in high school.
ClubShiraitodai's mahjong club gathers players from all over Japan. It has multiple teams which compete within their school. The group that wins get to represent the school in the nationals, this potentially means that Shiraitodai's top 5 players aren't representing Shiraitodai at the Nationals. Each group has its own theme. Teru and Sumire's team likes to focus on offense. Even the second-ranked team is considered to be prefectural representative level, while Teru's team is a national championship contender.
- Girls' team tournament
- Teru Miyanaga (vanguard)
- Sumire Hirose (sergeant)
- Takami Shibuya (lieutenant)
- Seiko Matano (vice captain)
- Awai Oohoshi (captain)
Up until the previous Spring tournament to the 71st Interhigh, Teru was tasked as her team's captain position. However, when she she showed that there was a great synergy between her ability and being the last dealer, she was placed in the vanguard position. This line-up generally means that Teru will either drop one of her opponents to 0, or make a very large lead for her teammates.
69th Inter High
- Main article: 69th Inter High School Mahjong Championships
70th Inter High
- Main article: 70th Inter High School Mahjong Championships
West Tokyo qualification
71st Inter High
- Main article: 71st Inter High School Mahjong Championships