Question 1

Where is Nanao Castle Ruins?

Accepted Answer

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

Question 2

Which scene of Insomniacs After School does Nanao Castle Ruins appear in?

Accepted Answer

Nanao Castle Ruins is a real place that appears in Insomniacs After School.

Question 3

Can I visit Nanao Castle Ruins?

Accepted Answer

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

Question 4

Where was Insomniacs After School filmed?

Accepted Answer

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