Reddit reviews Tokyo on Foot: Travels in the City's Most Colorful Neighborhoods

great work, as others have said. i think you underestimate its value. this is one of my favorite travel books and while it doesn’t have tons of “where to go” information, it served as a great reminder of the feel of tokyo (and your work reminded me of):

https://www.amazon.com/Tokyo-Foot-Travels-Colorful-Neighborhoods/dp/4805311371

that said, there are numbnuts who gave it lower ratings because of the lack of it being a true guide book, but they need to understand that is not what it is about, not to mention there are more than enough of those out there.

reminds be of the art in this book, but yours is much more sophisticated

This might be a little more offbeat than what you're looking for but Tokyo On Foot is really cool.

I know a great book for you but it's not manga!
It's kind of a picture book, everything is drawn by the artist Florent Chavouet who was in Tokyo for a few months with his girlfriend. He drew maps and illustrations of stuff he saw while he was there. Everything is so detailed, I think you and your girlfriend will enjoy it! It's called Tokyo on Foot

For manga, I would probably recommend <Gin no Saji>

Wonderful work. Kind of reminded me Florent Chavouet's stuff as well!