Question 1

Where is Kinu Wind Cave?

Accepted Answer

Kinu Wind Cave is in Nikkō, Tochigi, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of The Future Diary does Kinu Wind Cave appear in?

Accepted Answer

Kinu Wind Cave appears in EP13 of The Future Diary.

Question 3

Can I visit Kinu Wind Cave?

Accepted Answer

Yes. Kinu Wind Cave is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was The Future Diary filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Kinu Wind Cave is one of those real places (EP13).