Japan have been drawn in Group C in Brazil and have a decent chance of progressing from a pool that is expected to be one of most competitive in the tournament.
Alberto Zaccheroni's men start their campaign against Ivory Coast in Recife before then taking on Greece and Colombia.
And, ahead of Sunday's friendly with Group D outsiders Costa Rica, Inter defender Nagatomo has stated his belief that team spirit will be vital to Japan's chances of a strong performance.
"Heading to the World Cup, my target is to be 100 per cent fit and (have) high-level combinations with my team mates," Nagatomo said.
"The most important thing is to be united as a team. I want to be sure of those things."
Japan's chances of winning the World Cup are widely considered to be slim, but Nagatomo is dreaming of helping Zaccheroni's men spring a surprise.
"Since the 2010 World Cup finished, I've been conscious of the (2014) World Cup all the time, not only in training but also in my life," Nagatomo added.
"So I have a strong feeling that I want to win the World Cup."
