Question 1

Where is Shima No Yu Hot Spring?

Accepted Answer

Shima No Yu Hot Spring 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 Shima No Yu Hot Spring appear in?

Accepted Answer

Shima No Yu Hot Spring appears in EP8 of Wash It All Away.

Question 3

Can I visit Shima No Yu Hot Spring?

Accepted Answer

Yes. Shima No Yu Hot Spring 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 Shima No Yu Hot Spring is one of those real places (EP8).