Question 1

Where is Higashi-yamate No 12 Building?

Accepted Answer

Higashi-yamate No 12 Building is in Nagasaki, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Iroduku: The World in Colors does Higashi-yamate No 12 Building appear in?

Accepted Answer

Higashi-yamate No 12 Building appears in OP of Iroduku: The World in Colors.

Question 3

Can I visit Higashi-yamate No 12 Building?

Accepted Answer

Yes. Higashi-yamate No 12 Building is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Iroduku: The World in Colors filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Higashi-yamate No 12 Building is one of those real places (OP).