This is the featured school in the side story, Saki Achiga-hen episode of side-A.
Achiga is located in a rural part of Nara as evidenced by landmarks such as Yoshino Station in the series.
The school had a strong history of winning the Nagano prefectural tournaments, until Ryuumonbuchi defeated them.
This school is the top ranked team in the tournament and has won the last two national titles.
However, a rule which had been implemented forced Rinkai to field one Japanese player for their team.
The third seeded school and its members wear miko (shrine maiden) outfits and stay in solemn rooms during competitions.
For this years competition, all the branch families have come together so that Komaki Jindai doesn't have to carry the team by herself.
This team has a history of reaching the national tournament, however with bad results.
Koshigaya had never advanced into the second round in its previous four appearances in the Inter High until this year.