There don't seem to be any connections that are clear in the data. Many of these people are from the Tokyo metropolitan area, but that's also the largest nearby metro area, so that isn't unexpected.

A few of them appear to have home addresses in other countries -- New Zealand, the Philippines, and South Korea -- which is definitely out of place for a rural vacation spot in Japan at this time of year.

Mitsui Ryou's name is on the list, along with a home address for him in the Tokyo suburbs. (Aymeric will know his name from Ginia's information given at her IC cult investigation meeting.)