Question 1

Where is Marugame Castle?

Accepted Answer

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

Question 2

Which scene of Yuki Yuna is a Hero does Marugame Castle appear in?

Accepted Answer

Marugame Castle appears in EP10 of Yuki Yuna is a Hero.

Question 3

Can I visit Marugame Castle?

Accepted Answer

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

Question 4

Where was Yuki Yuna is a Hero filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Marugame Castle is one of those real places (EP10).