When entering the battle, if your team is pushed all the way back to the far left edge of the screen and both team captains are still able to battle, the game may initiate a 1-on-1 duel (一騎打ち). There will be a cut-in screen, followed by your leader and the enemy leader attacking each other. If you win the duel, you will win the entire battle, regardless of the remaining total HP of your team, and earn a special Rank S duel ranking