Question 1

Where is Nijo Castle?

Accepted Answer

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

Question 2

Which scene of Horimiya: The Missing Pieces does Nijo Castle appear in?

Accepted Answer

Nijo Castle appears in EP1 of Horimiya: The Missing Pieces.

Question 3

Can I visit Nijo Castle?

Accepted Answer

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

Question 4

Where was Horimiya: The Missing Pieces filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Nijo Castle is one of those real places (EP1).