Question 1

Where is Former Mitsubishi No.2 Dock House?

Accepted Answer

Former Mitsubishi No.2 Dock House 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 Former Mitsubishi No.2 Dock House appear in?

Accepted Answer

Former Mitsubishi No.2 Dock House appears in OP of Iroduku: The World in Colors.

Question 3

Can I visit Former Mitsubishi No.2 Dock House?

Accepted Answer

Yes. Former Mitsubishi No.2 Dock House 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 Former Mitsubishi No.2 Dock House is one of those real places (OP).