Question 1

Where is Otaya Serio?

Accepted Answer

Otaya Serio is in Takaoka, Toyama, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Oomuro-ke: Dear Friends does Otaya Serio appear in?

Accepted Answer

Otaya Serio is a real place that appears in Oomuro-ke: Dear Friends.

Question 3

Can I visit Otaya Serio?

Accepted Answer

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

Question 4

Where was Oomuro-ke: Dear Friends filmed?

Accepted Answer

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