Question 1

Where is Osaka Castle?

Accepted Answer

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

Question 2

Which scene of The Ryuo's Work is Never Done! does Osaka Castle appear in?

Accepted Answer

Osaka Castle appears in EP12 of The Ryuo's Work is Never Done!.

Question 3

Can I visit Osaka Castle?

Accepted Answer

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

Question 4

Where was The Ryuo's Work is Never Done! filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Osaka Castle is one of those real places (EP12).