Question 1

Where is Hana no Yu?

Accepted Answer

Hana no Yu is in Nasushiobara, Tochigi, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Slow Loop does Hana no Yu appear in?

Accepted Answer

Hana no Yu appears in EP9 of Slow Loop.

Question 3

Can I visit Hana no Yu?

Accepted Answer

Yes. Hana no Yu 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 Hana no Yu is one of those real places (EP9).