Question 1

Where is Maruo Shrine?

Accepted Answer

Maruo Shrine is in Nagasaki, Nagasaki Prefecture, 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 Maruo Shrine appear in?

Accepted Answer

Maruo Shrine appears in OP of Iroduku: The World in Colors.

Question 3

Can I visit Maruo Shrine?

Accepted Answer

Yes. Maruo Shrine 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 Maruo Shrine is one of those real places (OP).