Question 1

Where is Okuyama Gate?

Accepted Answer

Okuyama Gate is in Taito, Tokyo, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Heavenly Delusion does Okuyama Gate appear in?

Accepted Answer

Okuyama Gate appears in EP3 of Heavenly Delusion.

Question 3

Can I visit Okuyama Gate?

Accepted Answer

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

Question 4

Where was Heavenly Delusion filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Okuyama Gate is one of those real places (EP3).