The two teams meet in the Group E encounter with Japan struggling for form. A string of poor results and performances in 2010 have increased the pressure on coach and players.
Nakata, who retired from football after the 2006 World Cup, exclusively told Goal.com that there is hope.
"Of course, Japan have not had very good results this year and it has been a difficult time for the team,” said the former Roma and Parma midfielder.
“I am always optimistic though and the team can only go up and I believe they will give a good show in this World Cup. Japan have some very good players."
"The game against Cameroon is very tough but I believe that Japan will win."
Denmark and the Netherlands are the other two teams in the group and their match ends immediately before Japan take the pitch at the Free State Stadium.Become a fan of Goal.com International on Facebook! Just click onto Facebook.com/Goal to join the beautiful game's leading fan community..