The one and only location-based game I've been playing for about a year now

It's a unique game where you can become friends with your favorite Denko while checking in at your nearest station. I don't get many chances to ride trains, so I mostly travel by my own car, but checking in at unfamiliar places on unfamiliar lines when I occasionally go on a long trip is a casual joy. If you like location-based games, you'll definitely get hooked!