71st Inter High School Mahjong Championships Group 1

Group 1 of the 71st Inter High School Mahjong Championships includes the first seeded Shiraitodai High School and 12 schools that drew the 2–13 spots in the tournament.

First tournament round -- day 1
Winners of each first round match meet Shiraitodai, which has a bye in the first round.

Second tournament round -- day 5
Two winners of the second round match of Group 1 meet the two winners of Group 2 in one of two semi-final matches.