Question 1

Where is Kosaku?

Accepted Answer

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

Question 2

Which scene of mono does Kosaku appear in?

Accepted Answer

Kosaku appears in EP3 of mono.

Question 3

Can I visit Kosaku?

Accepted Answer

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

Question 4

Where was mono filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Kosaku is one of those real places (EP3).