Question 1

Where is Nijō Castle?

Accepted Answer

Nijō Castle is in Kyoto, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Chainsmoker Cat does Nijō Castle appear in?

Accepted Answer

Nijō Castle appears in EP11 of Chainsmoker Cat.

Question 3

Can I visit Nijō Castle?

Accepted Answer

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

Question 4

Where was Chainsmoker Cat filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Nijō Castle is one of those real places (EP11).