The matchday roster will consist of 18 players, and up to 3 substitutes will be allowed in a game.
[1] Rules for promotion to J2 are largely similar to those of the Japan Football League in recent seasons: to be promoted, a club must hold a J2 license and finish in top 2 of the league.
If either or both top 2 finishers are ineligible for promotion, the playoffs and/or direct exchange will not be held in accordance with the exact positions of promotion-eligible clubs.
Also, if an under-23 squad finishes in either one of the top 2 or both positions, the next-placed, promotion-eligible club takes automatic promotion to J2.
Up to 2 clubs may be promoted if they are licensed by the J.League for J3 participation and finish within the top 4 of the JFL.