Question 1

Where is Rouishin?

Accepted Answer

Rouishin is in Yokohama, Kanagawa Prefecture, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Rascal Does Not Dream of Santa Claus does Rouishin appear in?

Accepted Answer

Rouishin appears in EP8 of Rascal Does Not Dream of Santa Claus.

Question 3

Can I visit Rouishin?

Accepted Answer

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

Question 4

Where was Rascal Does Not Dream of Santa Claus filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Rouishin is one of those real places (EP8).