Japan played 13 friendlies in 2003 and 12 in 2004 plus all the official games under Zico.
2003
Japan 2-2 Uruguay friendly
South Korea 0-1 Japan friendly
Japan 0-1 South Korea friendly
Japan 1-4 Argentine friendly
Japan 0-0 Paraguay friendly
New Zealand 0-3 Japan Confederations Cup group stage
France 2-1 Japan Confederations Cup group stage
Colombia 1-0 Japan Confederations Cup group stage
Japan 3-0 Nigeria friendly
Japan 0-1 Senegal friendly
Tunisia 0-1 Japan friendly
Rumania 1-1 Japan friendly
Japan 0-0 Cameroon friendly
Japan 2-0 China friendly
Japan 1-0 Hong Kong friendly
Japan 0-0 South Korea friendly
2004
Japan 5-0 Malaysia friendly
Japan 3-0 Iraq friendly
Japan 1-0 Oman WCQ first round
Singapore 1-2 Japan WCQ first round
Hungary 3-2 Japan friendly
Czech 0-1 Japan friendly
Iceland 2-3 Japan friendly
England 1-1 Japan friendly
Japan 7-0 India WCQ first round
Japan 3-1 Slovakia friendly
Japan 1-0 Serbia&Montenegro friendly
Oman 0-1 Japan Asian Cup group stage
Thailand 1-4 Japan Asian Cup group stage
Iran 0-0 Japan Asian Cup group stage
Jordan 1-1 Japan Asian Cup quarterfinal
Bahrain 3-4 Japan Asian Cup semifinal
China 1-3 Japan Asian Cup final
Japan 1-2 Argentina friendly
India 0-4 Japan
Oman 0-1 Japan WCQ first round
Japan 1-0 Singapore WCQ first round
Japan 0-3 Germany friendly
2005
Japan 4-0 Kazakhstan friendly
Japan 3-0 Syria friendly
Japan 2-1 North Korea WCQ final round
2003
Japan 2-2 Uruguay friendly
South Korea 0-1 Japan friendly
Japan 0-1 South Korea friendly
Japan 1-4 Argentine friendly
Japan 0-0 Paraguay friendly
New Zealand 0-3 Japan Confederations Cup group stage
France 2-1 Japan Confederations Cup group stage
Colombia 1-0 Japan Confederations Cup group stage
Japan 3-0 Nigeria friendly
Japan 0-1 Senegal friendly
Tunisia 0-1 Japan friendly
Rumania 1-1 Japan friendly
Japan 0-0 Cameroon friendly
Japan 2-0 China friendly
Japan 1-0 Hong Kong friendly
Japan 0-0 South Korea friendly
2004
Japan 5-0 Malaysia friendly
Japan 3-0 Iraq friendly
Japan 1-0 Oman WCQ first round
Singapore 1-2 Japan WCQ first round
Hungary 3-2 Japan friendly
Czech 0-1 Japan friendly
Iceland 2-3 Japan friendly
England 1-1 Japan friendly
Japan 7-0 India WCQ first round
Japan 3-1 Slovakia friendly
Japan 1-0 Serbia&Montenegro friendly
Oman 0-1 Japan Asian Cup group stage
Thailand 1-4 Japan Asian Cup group stage
Iran 0-0 Japan Asian Cup group stage
Jordan 1-1 Japan Asian Cup quarterfinal
Bahrain 3-4 Japan Asian Cup semifinal
China 1-3 Japan Asian Cup final
Japan 1-2 Argentina friendly
India 0-4 Japan
Oman 0-1 Japan WCQ first round
Japan 1-0 Singapore WCQ first round
Japan 0-3 Germany friendly
2005
Japan 4-0 Kazakhstan friendly
Japan 3-0 Syria friendly
Japan 2-1 North Korea WCQ final round