Question 1

Where is Appa Hassu Ichibankan?

Accepted Answer

Appa Hassu Ichibankan 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 Sisters does Appa Hassu Ichibankan appear in?

Accepted Answer

Appa Hassu Ichibankan appears in OP of Oomuro-ke: Dear Sisters.

Question 3

Can I visit Appa Hassu Ichibankan?

Accepted Answer

Yes. Appa Hassu Ichibankan 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 Sisters filmed?

Accepted Answer

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