How it will be...
Japan, predictably, would not dissolve into panic. Their response to an early setback involves a stoic retreat into a tightly packed formation, absorbing pressure like a well-constructed breakwater. The defensive line will drop to the penalty area edge. The midfield will tuck inside to block central passing lanes.
The spectacle would then settle into a tense holding pattern. Brazil's veteran pivot will dictate the tempo, orchestrating sterile possession to deny the underdog counter-attacking routes. We might see the South Americans' improvisational flair, but strictly confined to the final third. If the Asian side’s late crossing lacks precision, their industry will simply bounce off a resolute, aerially dominant defence.