Question 1

Where is Shinsekai?

Accepted Answer

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

Question 2

Which scene of NIPPON SANGOKU does Shinsekai appear in?

Accepted Answer

Shinsekai appears in OP1 of NIPPON SANGOKU.

Question 3

Can I visit Shinsekai?

Accepted Answer

Yes. Shinsekai 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 Shinsekai is one of those real places (OP1).