Question 1

Where is Comia?

Accepted Answer

Comia 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 Comia appear in?

Accepted Answer

Comia appears in EP12 of Rascal Does Not Dream of Santa Claus.

Question 3

Can I visit Comia?

Accepted Answer

Yes. Comia 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 Comia is one of those real places (EP12).