I think basketball is the most popular in Japan. There are a lot of basketball teams in Japan. In my hometown there is a famous basketball team the name is Kumamoto Volters. It is pro basketball team and all members are really strong player.
I think Kenshi Yonezu is popular. He songs a lot of Japanese anime's songs, and those animes are really popular all over the world. Therefore, I think "Peace Sign" and "KICK BACK" are famous songs.
In Saitama, there is a good movie theater. We can see a movie while sleeping on big bed there. We can use it for 4000 yen.
Japan has a lot of great fireworks conventions. We can see about 10,000 fireworks are launched. It is great.