Nippon Shounen Soccer Kyoukai

Japan Youth Soccer Association (日本少年サッカー協会) is a location.

Info
It was revealed in episode 4 that Gouenji Shuuya works in here.

Shindou Takuto came here to talk about Kuroiwa Ryuusei and the backup team of Shinsei Inazuma Japan with Gouenji.