The playmaker says he and his team-mates are focused on grabbing their opportunity in Brazil and that he will play the tournament as if it is his last
The AC Milan star is currently with his team-mates in Florida preparing for their World Cup campaign.
Japan will take on Costa Rica on June 2 looking for a fourth consecutive victory, before their final warm-up game, against Zambia on June 7.
“I think we are all ready to shock the world,” the 27-year-old told newspaper Kyodo.
“We just have to believe in our style and play like we normally do. Right now, we are focused on going as far as possible.
"The World Cup only comes around once every four years and there is no guarantee that I’m going to be around in four years’ time. So I want to play this tournament as if it will be my last.”
Japan begin their tournament against Cote d'Ivoire on June 15, before taking on Greece and Colombia in their remaining group stage matches.