Question 1

Where is Hirayu-no-Yu?

Accepted Answer

Hirayu-no-Yu is in Takayama, Gifu Prefecture, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Hyouka does Hirayu-no-Yu appear in?

Accepted Answer

Hirayu-no-Yu appears in EP7 of Hyouka.

Question 3

Can I visit Hirayu-no-Yu?

Accepted Answer

Yes. Hirayu-no-Yu is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Hyouka filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Hirayu-no-Yu is one of those real places (EP7).