Alberto Zaccheroni's men failed to score for the first time in nine matches in their 2-0 defeat at the hands of Serbia in Novi Sad.
The Italian, who has already led his team to the World Cup, played a relatively strong side, including Keisuke Honda and Shinji Kagawa.
"I couldn't do anything," Kakitani said.
"It's almost embarrassing."
Japan defender Yuto Nagatomo lamented his team's inability to create more opportunities with their width.
"The middle of their defence was solid, so Keisuke and I talked about attacking from the wings," he said.
"But they put a lot of players on the sides and we weren't able to get anything going."
Georgi Kondratiev's men have at least troubled powerhouses France and Spain in their most recent World Cup qualifiers.
Krylia Sovetov Samara striker Sergei Kornilenko, who scored against Spain, shapes as the most dangerous threat to Japan's chances of winning.
