Question 1

Where is Marunuma Kohan-tei?

Accepted Answer

Marunuma Kohan-tei is in Katashina, Gunma, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Slow Loop does Marunuma Kohan-tei appear in?

Accepted Answer

Marunuma Kohan-tei appears in EP3 of Slow Loop.

Question 3

Can I visit Marunuma Kohan-tei?

Accepted Answer

Yes. Marunuma Kohan-tei is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Slow Loop filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Marunuma Kohan-tei is one of those real places (EP3).