As two of the three users spin in the air, they quickly land on the field near the user in the middle, who stands with their arms crossed by the goal. The user in the middle then extends their arms forward and joins both of their hands, opening them up in opposite directions as the two others lay both of their hands on their shoulders. As the ball heads towards the goal, all users get slightly pushed back into the goal, stopping at the goal line and catching the ball if successful.
Interestingly, in the Inazuma Eleven game, it lacks any typography whenever it's used in a scripted event.
As Mamoru was looking through Daisuke's notebook for a strong technique[2], an illustration of Triple Defense is shown.
The technique depicted, however, has all users with their arms outstretched to create an energy barrier, which would differ from all of its known usages.