Tsutsuishi Station in Itoigawa city, Niigata prefecture
https://maps.app.goo.gl/Wjvx8wmVhczUDQTo9

Wikimedia:
https://commons.wikimedia.org/wiki/File:Tsutsuishi_20200320183252_(50308260036).jpg

Or this a sort of service station or just a very narrow passenger station?

AlsoSprachOdin said in comment #2630651:

Or this a sort of service station or just a very narrow passenger station?

Platform of passenger station inside the Kubiki Tunnel
https://en.wikipedia.org/wiki/Tsutsuishi_Station

Aside from the catgirl, this and the outside photo in the wiki article are just incredibly melancholic. The visual equivalent of "all around me are familiar faces..."