Question 1

Where is Gonbei?

Accepted Answer

Gonbei is in Itabashi, Tokyo, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Blue Box does Gonbei appear in?

Accepted Answer

Gonbei appears in EP2 of Blue Box.

Question 3

Can I visit Gonbei?

Accepted Answer

Yes. Gonbei is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Blue Box filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Gonbei is one of those real places (EP2).