Question 1

Where is Ohshimaya?

Accepted Answer

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

Question 2

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

Accepted Answer

Ohshimaya appears in EP4 of Botan Kamiina Fully Blossoms When Drunk.

Question 3

Can I visit Ohshimaya?

Accepted Answer

Yes. Ohshimaya 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 Ohshimaya is one of those real places (EP4).