Question 1

Where is Izusan Post Office?

Accepted Answer

Izusan Post Office is in Atami, Shizuoka, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Wash It All Away does Izusan Post Office appear in?

Accepted Answer

Izusan Post Office appears in EP11 of Wash It All Away.

Question 3

Can I visit Izusan Post Office?

Accepted Answer

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

Question 4

Where was Wash It All Away filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Izusan Post Office is one of those real places (EP11).