Question 1

Where is Kosekiya (Annex)?

Accepted Answer

Kosekiya (Annex) is in Obanazawa, Yamagata, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of NIPPON SANGOKU does Kosekiya (Annex) appear in?

Accepted Answer

Kosekiya (Annex) appears in EP4 of NIPPON SANGOKU.

Question 3

Can I visit Kosekiya (Annex)?

Accepted Answer

Yes. Kosekiya (Annex) is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was NIPPON SANGOKU filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Kosekiya (Annex) is one of those real places (EP4).