I went to Nagaoka fireworks festival in Nagaoka city with my family.
I had never seen such large and many fireworks!
This video is summarized briefly.
From 7:10, main program starts.

Nagaoka fireworks festival is one of the three biggest fireworks.
It launches 20.000fireworks in two nights.
Nagaoka fireworks festival is the festival for restoration from war devastation.

・Access
You can go to Nagaoka city by Shinkansen from Tokyo.

AloJapan.com