Go Go Nippon is a short visual novel that serves as a surface-level travel guide to the main tourist areas of the Tokyo region. There's a romance sub-plot with the two sisters who are hosting the player character on his trip to Japan, but the focus is mostly on showing you trivia about the local attractions.

It's not necessarily a bad way to have a simple travel guide to give you ideas of where you might like to visit for real, but it's limited in scope and the writing isn't great - especially with how weird it is for your character to be obsessed with Japan, become entirely fluent in the language and then somehow be clueless about how toilets work.