I had no idea it was like that
we were able to watch VNL in Hong Kong last 2019 without any issues
We don't know anyone in Japan...
The arena does not have a lot of food options, so do bring food with you. Also there is not much for dining immediately around the arena as well. Kasadera is the stop for the arena that is closest and about 10 minutes from Nagoya station. Nagoya station has tons of dining options and also bento boxes available in the station.
The entrance area is basically where all of the bathrooms and vending for food and drinks are.