Acting Coach Senirusi Seruvakula says they will be looking to build on the positives from their win over Canada.
Japan are expected to provide a different challenge, with their pace, discipline and attacking style likely to test Fiji across the field.
He says Fiji will be aiming to maintain their winning momentum and put themselves in a strong position as they battle for honours in the Pacific Nations Cup.
Fiji will face Japan in the finals this Saturday at Prince Chichibu Memorial Stadium in Tokyo at 7.05pm.
