Question 1

Where is Koganeyu?

Accepted Answer

You can see the exact position of Koganeyu from the map coordinates and the Street View link.

Question 2

Which scene of Botan Kamiina Fully Blossoms When Drunk does Koganeyu appear in?

Accepted Answer

Koganeyu appears in EP8 of Botan Kamiina Fully Blossoms When Drunk.

Question 3

Can I visit Koganeyu?

Accepted Answer

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

Question 4

Where was Botan Kamiina Fully Blossoms When Drunk filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Koganeyu is one of those real places (EP8).