Here’s an invitation to play flag football from the KumAJET page:
“On September 15th (public holiday) there is a flag football tournament just north of Kumamoto city. It’s a relaxed day playing against a JHS team and a few other teams. If you would like to join us or, have 5 players to start a team, I can supply more details. We also play in the Kyushu tournaments traveling to other prefectures which is a good opportunity to see the sights.”
https://www.facebook.com/groups/45261511655/permalink/10152379945941656/