Question 1

Where is Kanoiwa General Hospital?

Accepted Answer

Kanoiwa General Hospital is in Yamanashi, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of The Day I Became a God does Kanoiwa General Hospital appear in?

Accepted Answer

Kanoiwa General Hospital appears in OP2 of The Day I Became a God.

Question 3

Can I visit Kanoiwa General Hospital?

Accepted Answer

Yes. Kanoiwa General Hospital is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was The Day I Became a God filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Kanoiwa General Hospital is one of those real places (OP2).