A game system comprising at least one processor configured to: execute a sport game based on a first character group operated by a user; set any one of a plurality of roles as a role to be played by the user in a match; acquire basic locations of first characters based on formation data on the first character group; set a plurality of the first characters corresponding to each of the plurality of roles based on the basic locations of the first characters; select a plurality of operation subject candidates from among the first characters based on the role of the user and a setting of the plurality of the roles; switch an operation subject of the user among the plurality of operation subject candidates during the match; and cause the operation subject of the user to act based on the user's operation during the match.